muncie 4 speed schematicmuncie 4 speed schematic

Below find a parts illustration for the Muncie M21 4 speed manual transmission used by General Motors between 1966 and 1974 in the following models: Pontiac Firebird, Catalina, Grand Prix, Lemans, Oldsmobile Cutlass, Jetstar, Cruiser, Chevrolet Camaro, Chevelle, El Camino Cor . This page is not available in other languages. TRANSMISSION PRODUCTION CODE NUMBER LOCATION. The following six digits were the last six digits of the VIN. retainer to case Start by using plenty of grease and insert the spacer tube. Other Manual Transmission Links. Buy factory direct, let us help you save some money! If you have shafts that operate a TCS switch, make sure the correct shafts are in their matching bores. Main shaft rear, 42) Ring, Main High Performance Forged Synchronizer Rings made by Synchroking! The location of the VIN stamp can vary but it can usually be found on the top leading edge of the main case or on a mounting surface near the Build Date Code. It replaced the T10 in General Motors' cars, starting in February of 1963. This one tapped gently into place. I coat the outer edges of the sidecover seal with Permatex 51813. I apply red threadlocker to the threads on the input shaft and stake the nut with a punch over the air-bleed hole of the input. Small parts include needle bearings, snap rings, thrust washers, needle spacers, front nut, oil slinger, reverse detent spring, reverse detent ball, strut keys, and strut key springs. They are found primarily in GM and Chevrolet trucks, Blazers, Suburbans and many other models falling under the 1/4-ton to 1-1/2-ton platforms. Another common repair is a rear seal change. Need an individual part (call with item number off the illustration below) or need a rebuilt transmission, bearing overhaul kit or other parts, give us a call888-824-2012, free technical support. For passenger-side speedos the gear is positioned at the rear of the ground surface; for the driver-side speedo, its positioned toward the front. Start by placing the 1-2 shifter shaft in the second-gear position. Italian gear sets, roller bearing clusters, Heavy Duty shift plate (M23 Super Finish shown) 4th Synchronizer These casting numbers are always the numbers you want to refer to when looking for a part at a swap meet or while using the modern-day swap meet, the Internet. (5/16"-18), 81) Lockwasher, assy., Transmission In fact, most current parts exceed the fit and finish of the original GM parts. The number of characters in the VIN stamp varied. It helps make your rebuild look more professional. ! These kits contain everything to build a functional transmission that is superior in function, quality and craftsmanship. A third variant was the light-duty rear wheel drive Turbo-Hydramatic 180 used in many European models. The SM465 was made by General Motors from 1968 to 1991. Transmission It may be advantageous to pull a transmission apart one way and assemble it another way. Muncie 1965-72 1965-68 Pontiac 1966-72 "A" . 2nd Synchronizer, 34) Sleeve, 1st. Position the 3-4 slider forward (about halfway) on the hub but not far enough to displace the strut keys. If you are reusing your old cage, hold the needles in place with grease on the outside perimeter of the cage and gently push it into place. The 1964 Muncie transmission was a basic carryover of the 1963 transmission with the exception of the 1964 and later gearboxes used a first gear sleeve on the main shaft for better lubrication. Be careful not to go too far or the ball pops out. GM Muncie SM420 Transmission. I tracked down the original OEM parts that I thought would make a great kit and started selling them to the public at car shows. The next step is to drop in the reverse idler. 0 Use a small screwdriver to snag and drag the C-clip off the 5/16-inch-diameter detent cam. bearing, 11) Gasket, Clutch You have to remove this pin from the bottom. Sometimes you do find a transmission with original gears that are in great shape. The letter M was used to ID the Muncie plant for the Muncie 3 speed, so P was the next logical letter. Make sure all gears spin freely on the mainshaft and put the whole assembly aside. 2. If you had to press the hubs off, you most likely have to press them back on. Here, Im using a block of wood. xu=|un/f)Tzj f5]6%&x7RucO,Mm!W#GSMtnT{zLXTTGq))- Flip the driver upside down and gently tap in the seal until it is seated. Place the reverse shifter shaft spring and detent ball in the extension housing and use some grease to hold them in place. On the other hand, St. Louis-built passenger cars had the letter "S" as the first digit. assy., Transmission, 55) Bushing, Trans. bearing retainer It is documented that from 196264, Corvettes did not use an assembly plant designation for the first digit. Always check to see that the date marked precedes the final assembly stamp code. Some have one that is .015-inch and the other is .030-inch thick. Installing the Engine Reply. shaft The SM465 is an outstanding, heavy-duty truck transmission designed and used in , 3/4 and 1+ ton trucks. If so, remove it from the extension. The reverse shifter shaft lock pin is a No. There are two types of date coding. General Motors decided to develop a 4-speed in-house to eliminate dependency on the T-10. Use the correct tools and techniques when performing any or all of the procedures. I spend most of my time building new transmissions with all-new parts. The circular springs keep tension on the gear to prevent rattles. Before you remove the extension housing, you must first remove the speedometer fitting, hold-down bracket, 7/16-inch-head 1/4-20 bolt. clutch, 18) Bearing assy., This means that you should also replace the cover. The engine and transmission were stamped at the same time by the final assembly plant. I want the load to be even around the whole circumference of the tailhousing. (The M does not stand for "Muncie.") Typically, when you ordered a GM car you had standard options and accessories installed. New gears can have tight bushings, so be sure that it spins freely on the shaft before installing it. [Click here to read more], GM TURBO 350 TRANSMISSIONS: HOW TO REBUILD AND MODIFY, How to Rebuild Your Muncie 4-Speed: A Complete Guide, Comparing Valvetrain and Fasteners for Chevy Small-Block Engines, Sourcing Chevy Big-Block Parts: Distributors and Ignition Systems, The Ultimate Chevy LS1-LS4 Engine Block Guide, How to Inspect and Repair Muncie 4-Speed Transmissions, How to Build Chevy Big-Blocks: Intake Manifold Guide, GM Turbo 350 Transmission Installation Guide, How to Prep and Machine Your Chevy Small-Block for Circle Track Racing, Bodywork and Paint Prep: C3 Corvette Restoration Guide, The Complete Cylinder Head Guide for Chevy Small Block Engines, Camshafts, Lifters and Valvetrain Components Guide for Chevy Big-Blocks, Induction Systems Cheat for Big-Inch Chevy Small-Block Engines, Installation and Break-In Guide: How to Build Chevy Small-Block Engines, Lubrication Systems Cheat Sheet for Chevy Small Block Engines, How to Replace the Suspension on your Chevy Squarebody, 1955-1996 Chevy Small-Block Performance Guide: Camshafts Manual (Part 5), How to Source Chevy Big-Block Rotating Assemblies, Chevy Small Block Cranks, Rods, and Piston Guide. Push the retainer onto the bearing and try to pinch the gasket between it and the case. At this point, the geartrain is completely apart. Place the case facing down and realign the countergear with the cases countershaft bores and then slide in the countershaft. This application uses a wide rib. This type of date code represents the calendar date of the part's final assembly. 1967-1974 production codes will start with the letter P and have five numbers, for example: P9D09. Reverse idler front QQtx:ES~U*T.Ly&(6*'? 7s The remainder of the Corvette VIN stamp was the last six digits of VIN, i.e. Use this method on every gasket surface on the transmission. Muncie M21 Parts illustration. Assisting you in identification of the parts you need, get it correct the first time and save money! The Muncie transmission was an aluminum main case/extension housing, side-loaded transmission with a side-lever shift linkage. used), 33) Spring, 1st & Place the slinger on the input shaft and tap on the front bearing. Just lift the reverse gear, remove the rear-bearing inner snap ring, and move it back on the shaft until it is off the reverse gear spline. Just three types of Muncie 4-speeds are available based on the RPO (regular production option) code used when a car was ordered: the M20 (standard wide-ratio), M21 (close-ratio), and M22 (heavy-duty close-ratio). I typically replace the forks because most are worn, and they are just too old. U.S.-made nuts have a better thread-fit than nuts made in China. The sidecover alignment dowel is located below the upper right bolt. The number of characters in the VIN stamp varied from plant to plant. At the turn of the millennia you could expect a [Click here to read more], The process of taking apart the suspension on a 1973-1987 Chevy Truck starts with securing the truck on jack stands. Vehicle Identification Number Stamped Into The Main Case. Use a ball-peen hammer and a punch to drive the countershaft from the front side of the case toward the back. 2Gl1/ifguO?XP2-c lFy"NhAY5yeK|QmS?virona)zK&prluW7bwMul82A:qt_ulq2+(z SB,XWjx;g{9^7g,A,e#H@F8X}KoJ!#,w9vjQJe20Qfq&|HFC'_oX1\d.hk[443=up^})(A7QVQl:r^]9}DB*m };"\Xx1}$!S/_3c|x:UNR-t]+g=~'xp2 5 ej&Em.DRG+Ls\iptgI@'pwHLN198bkjjnDk~6LiI$l{wv\;~ ]u|.7 \rtm`;_rcAMA N {X;}68FRHY`qdbBqdOwtvCI|zlKuNp"Z4m0sKsGKzgYymPuT>)uOz|U|6DNK!1oUQn )Air4rPCc"7uM''*]ggUj?^byfUTLzhcS>!d|uMweF@^MTS}!6yey # Seat the nut with a swift strike from a hammer on the wrench. The Muncie 4-speed was GM's answer to the T10, and by mid 1962 full working prototypes had been built. I always replace these with a 20-pound cover spring. The original design retainer was manufactured out of aluminum, but the later replacement retainers were made out of cast iron. 29) Ring, 3rd & 4th Synchronizer blocking. 3. Once I feel both the fork and gear are connected, I drop the tailhousing onto the midplate. lever to shaft If you want to clean up and detail the engine compartment of your car, there is no better time. shaft (5/16"), 65) Seal, Shifter lever to Filed Under: Chevy Tech Tips, Transmissions, Power adders have been used since the earliest days of the automotive industry, and they continue to be a popular method for boosting engine performance cost effectively and reliably. Once you have adequately tapped on the bushing, the bushing drops right out. Most early electronic transmissions use the "-E" designator to differentiate them from their non-electronic cousins, but this has been dropped on transmissions with no mechanical version like the new GM 6L80 transmission. Be careful because you dont want to damage the mating surfaces. Confused? [1] This list includes some GM transmissions. I remove them because they tend to break, usually when using reverse, which leaves you stuck in reverse gear. add #10. muncie 4 speed shifter, no mount, no linkage, repro. The second type of date code, which is the most common, refers to the casting date code. The main case date code is usually found on the passenger side of the case just below the casting number. %%EOF blocking, 37) Gear, Some sliders are very loose and can drop off the hub. I run the actual countershaft that I will use through the countergear outside the transmission so that I can feel for any high spots, possible binding, or a bent shaft. If the pin is really loose, replace the cover. You can pull the shaft out of the back of the case, and then safely store it. Muncie manual trans. Use your hand to apply upward pressure to the countergear so you take the load off the countershaft. Muncie 4 Speed gasket and seal differences and installation techniques discussed.Get the Gaskets HERE: http://goo.gl/nTpY0HMy #1 BOOK ON MUNCIES IS: http://a. Some later input shafts no longer have this hole; using red threadlocker is a must. A Dremel or rotary tool is helpful for deburring gears. 9 represents the model year. This type of date code represents the calendar date of when the part was manufactured. Remove the side cover and forks for a look at the geartrain. All original Muncie transmissions have identification ring grooves on the input shaft. Copyright 2022 Ecklers Automotive. Catch the edge of the seal with the chisel and punch it out. PRE 69' MUNCIE & ALL BORG-WARNER SHAFTS MIDWEST MUNCIE Specializes in ONLY MUNCIE 4-SPEEDS unlike any other transmission builder and has been specializing in restoration and building of Muncie 4 speeds since 1976. fits all muncie m20, m21, & m22 models; includes gaskets, & seals; also includes smaller bearing retainer gasket for some very early units with smaller retainer; Speed synchronizer, 32) Ring, 1st & 2nd gear sleeve oil, 66) Nut, Shifter This Muncie has 27 splines and is side loaded has an aluminum transmission case, extension housing and 7 bolt side cover. /*%BpTCifDevg"v~D#({>&c+d6Bm]b{epm]eX$b"EY. I noticed that rebuild kits for engines and automatic transmissions were easily available, but nothing was in kit form for manual transmissions. Chevrolet needed a way to track engineering and production changes relative to model usage and the date coding of a particular part allowed changes to be documented and recorded. Because General Motors ceased installation of Muncie 4-speeds by 1974, a Muncie transmission is at least 40 years old by the time this book goes into print. reverse, 45) Plate, Reassembling the mainshaft is pretty much a reverse of the disassembly procedure. bearing, 6) Spacer, (Cheap light-duty wrenches are good for only one or two uses.) Within 10 minutes the pin is locked and sealed in place. If you have to pull it apart again, it is one less step to perform. Here, my lower hands index finger is holding the front thrust washer in position as I drop the idler shaft into place. C-ear thrust, 53) Gasket, Rear shaft (5/16"), 82) Lever, 1st & - front, 17) Gear, The SM420 is an impressive, heavy-duty truck transmission designed for and used in , 3/4, 1 and 2 ton trucks. driven gear However, many people misunderstand what really constitutes a complete rebuild. Through the 1950s, all makers were working on their own automatic transmission, with four more developed inside GM alone. {'n`m9*brg0XZaf_]1{EdA |~)?X5tv@6RXd;~GT)'A >;ejoBfhO:n\`reX(sWFE) 9dz4bV |vn(NO}"CsOwFm[NP85t6[4oSW?QQ}nZLRN 6D}#92wN e_.?]|;wA >5SH_Jgstw6KlC' 28Gr+J{Di ]\Myv<>ngAQEtr(gptEqYRX62%pF+|D Cvxsl>{@QTVRXBeI?y)WNSrWv|-Y8kMr( .d~ :x]},Sz]})L9i ]S n0\#Rz,m]*Tq="w1 I use a skin coat of 51813 Permatex sealant on the case. This was accomplished with minimal changes to the overall design. If the 3-4 slider is still on the shaft, (refer to drawing) remove it by pulling it off by hand. gear thrust, 50) Gear assy., (451) 7 bolt side cover used from 1963-68 * MUNCIE Shaft Identification The above Muncie 4 speed transmissions can be distinguished from the style of the transmission arm attachment. The shifter mounting plate and transmission mount bolt holes usually have stripped threads or seized bolts. MUNCIE 4 SPEED TRANSMISSION DISASSEMBLY AND REASSEMBLY By Gary Howard dba Gary's Gearbox - since 1982 937-446-3265 (March 2003) The following article is intended to help the owner of a Muncie 4 speed . reverse shifter, 63) Lever, Pry near the dowel to remove the cover. New combs are harder and much better than the older ones. Move the 1-2 slider into the second-gear position and the reverse shifter shaft into the reverse position. driven gear, 60) Retainer, I always say, Dummy shafts are for dummies. You have no final visual with a dummy shaft. If you have to press it on, support the bearing by the inner race and press the input shaft into it. Once clamped, the 51813 Permatex sets up within 15 minutes. Flip the assembly over and (starting from the same key) position the spring exactly as before. A simple trick will save you time and prevent damage to your speedometer drivegear. cam retainer This is an easy repair because failure of the retainer is not caused by something internal. These have a tendency to fly off the cover and get lost. 'Muncie' 4-speed Manual transMission asseMBlies, Gears & parts HiGH perForMance 1963-1974 AUTO GEAR EQUIPMENT AUTO GEAR EQUIPMENT 530 State Fair Boulevard, Syracuse, NY 13204 (800) 634-3001, Inside New York: (315) 471-8141 Fax Numbers: (315) 471-8146 or (800) 537-4213 Email: service@autogear.net Use a 3/8-16 bolt as a tap surface for bolt-on shafts. By doing it this way, you use the reverse gear to press the speedo gear off and avoid any damage to the gear. Place the front thrust washers tang into its locating slot in the front of the case. bearing retainer Often this circle is blank. (Please refer to the component casting chart and the location of the transmission build date to determine the correct model year and application for the part.) Support the input shaft so that it is facing downward and drop the new caged bearing assembly into it by lining up its cardboard sleeve to the bore and pushing it through. This is not model or year specific. Sometimes you can spread the bushing end. . Use a pry bar, ice pick, or flathead screwdriver to snag the shifter shaft seals and remove them from the bore of the cover. The 1963 transmission had a smaller front input shaft bearing and a specific front bearing retainer with a smaller outside diameter than the Muncie transmissions from 1964 and up. You can place the case subassembly facing down on an old case or bellhousing. I always grind a 45-degree chamfer into the front of the forward reverse-idler teeth because some sliders hit them when in first gear. Pre-1969 Muncies use a stud and nut at the indicated attachment point, while 1969 and later Muncies use a bolt as illustrated on the right. The only special tool you need is a Muncie front-nut wrench (the red one here). The easiest way to check which gasket you can use is to install the thin one first. Early units had a 1/2-inch head. TempestTorque, ( Pontiac) a two speed based on Powerglide, but having the added feature of " Split Torque " dividing the engine power between mechanical connection and the torque converter in high gear. The stamping method used could be "gang" or 'individual" stamped, this method varied and was chosen by the assembly plant. case (5/16"int. The original ring groove for each transmission is shown below in the following charts. Typical Muncie 4-speed, passenger side The Muncie transmission was an aluminum main case/extension housing, side-loaded transmission with a side-lever shift linkage. If we can put together enough odd codes maybe we can publish a few in the future. Light tapping should drive the bearing out of the bore. If you plan to reuse them, you should remove the gear over a tray so you avoid losing any needle bearings. shifter shaft The Muncie was used in all high performance applications until the Borg-Warner Second Design Super T-10 began replacing it in 1974. In this case, youre loading 112 needle bearings. Transmission 3rd Speed. If you cant, use that gasket. Remember that nothing smaller than 350 ci is worth building. There was only one side cover casting number used during the 1963 and 1964 model year. Soft parts are included in a rebuild kit but hard parts are not. Muncie Transmission Identification. This type of date coding is used on engine blocks, heads, transmission main case, transmission tailhousing, transmission side cover, etc. You can also use the non-press or manual method to remove the front bearing. All Muncie transmissions have a ring groove on the input shaft and counter gear. Sometimes you can pry on this and remove the bearing. Let me explain. shaft rear bearing 1st, 2nd, 3rd, 4th, 78) Belt, Cover to If they are really bad you should change them out. Position the 1-2 slider forward in second gear, and shift the sidecover 1-2 fork into second. The next-generation transmissions, introduced in the early 1990s, were the electronic Hydra-Matics based on the Turbo-Hydramatic design. Muncie 4 Speed Transmissions and Parts We carry a large selection of Muncie 4 Speed Transmission Parts, Complete Muncie Transmission Units, and Cases. Getrag 260 5-speed longitudinal manual made by Getrag. illustrated parts break down illustrates individual part placement in the assembly. Position the nut with the tapered side facing forward. The store will not work correctly in the case when cookies are disabled. 33),WrPc J+lv&*iYk^5lmi)VA.f/|g% For the best experience on our site, be sure to turn on Javascript in your browser. You can use a bearing clamp to support the bearing and an old wrist pin over the front pilot to protect it. hbbd``b`@ H0_A ' Apply the case to the midplate gasket and then apply another skin coat to the gasket. This code will be stamped onto the main case. (5/32"x 1-1/4), 70) Spring, Log in to add vehicles or quickly search your stored vehicles. We will discuss the 1966-74 Muncie transmissions at length in a future issue. Install the rear washer and push the whole countergear to the bottom of the case. Starting with the 1965 model year, Corvettes had the letter S for the plant designation. shifting Well, there you have it. Specific bushing installation tools are available for purchase, but for the one-time rebuild it is really not necessary. add #12. shifter boot retainer & bezel plate ,manual new 67 68 camaro 68-73 nova . Cases are either. Today, GM uses a simple naming scheme for their transmissions, with the "Hydra-Matic" name used on most automatics across all divisions. ), 72) Pin, Reverse I use a chisel that I have sharpened to remove the rear seal. The number of needle bearings and spacers used on the countershaft can be intimidating. The 1964 maincase casting number was #3851325 and was used through the 1965 model year as well. It is the successor to the old "New Process" gear company. endstream endobj 150 0 obj <>stream You can use a pipe wrench if you are careful. 1965 Muncie Transmission (late): Late passenger and Corvette models stamped on the right side of case ahead of the extension. Also, the first speed gear in 1963 transmissions ran directly on the main shaft with a thrust washer. Press the mainshaft through the complete assembly all in one shot. Read further about Chevrolet's favorite gearbox. All rights reserved. You will disassemble it later. Remove both shift levers and mark them so they can be replaced in the same bores. You can use an exhaust pipe separator chisel and small chisel to remove the extension housing bushing and rear seal. 04 represents the month code when the unit was assembled, April. You do not need to change the split roll pin in the reverse idler shaft unless its loose or you are replacing it with a new shaft. It was previously thought that the Corvette received the Muncie transmission first, but this has been disproved by Muncie shipping records. Transmission Just remember, when you think you have seen every variation possible a new one will pop up. Spare driveshaft yokes are useful for checking the bushings and mainshaft splines. Put your other hand over the C-clip to catch it once it clears the cam. Placing it forward makes it easy to attach the fork to the reverse gear. 30) Spring, 1st & 2nd Synchronizer . The Turbo-Hydramatic was used by all GM divisions, and formed the basis for the company's modern Hydramatic line. Speedometer Supercharging (forcing air into the engine) to boost compression [Click here to read more], A factor more influential toward successful high-performance engine building than any other is the cylinder heads. Your #1 Source of Restoration and Restomod Parts! The countergear is still dropped to allow it to be placed in this position. Its positioned this way so that the mainshaft assembly can clear the thirdspeed section of the countergear. Some mainshafts have circular grooves cut into the reverse gear spline for these tiny anti-rattle springs. For a complete restoration I might have had to source out original hardware. (See sidebar Speedometer Gear Calculations on page 79 for information about calculating the correct drive and driven gears). If you think you are going to reuse them, mark the position and orientation of each fork so they can be reinstalled in the exact position. The 3-4 slider and keys fell out when I removed the mainshaft. Chevy Muscle Car Tech Tips, Guides, Articles & How-To. blocking, 27) Gear, However, the Corvette assembly plant in St. Louis from 1962-1964 was relatively consistent. One circle is the Date Marker and the other circle is referred to as the Status Marker. Place the exhaust pipe separator chisel in the oil return slot. By 1981 I had developed the first retail rebuild kit for the Muncie. Shifter lever to 1963-1964 production codes will be stamped on the right side of the main case. 5-SPEED TRANSMISSION I.D. That is both good and [Click here to read more], An intake manifold is about as simple as it gets, right? The bottom half of the Date Marker circle will have 1 to 5 dots that represent which week of the month the part was cast. =7r+`d,v8rG(Kw^\S<>>oooawW,"gf :u# R Make sure the bore is free of chips and metal burrs before installing a new bushing. Be careful not to damage the bore. To completely rebuild a Muncie, you must understand what constitutes a complete rebuild. Shifter lever to 1965-72 4 spd. locating, 16) Gasket, Rear 1956-1964 4 speed Controlled coupling HydraMatic, also known as Cadillac 315 or P 315 HydraMatic, Oldsmobile Jetaway, Pontiac Super HydraMatic. Characteristics of the VIN stamp, including the location of the pad, the type size of the stamp, and the stamping method (gang or individual), was chosen by the final assembly plant. If you are reusing a case with a stock bore, use 51813 Permatex to coat the front bore and rear of the shaft. The date marker has a month designator for when the part was cast or manufactured. Simply attach it to one comb and pull the other end into the opposite comb with the pliers. If you liked this article you will LOVE the full book. 2nd. This parts deals with case preparation.Mu. The factory never used lock washers and they are often seized and break. If the case was damaged from a gear explosion, the thrust washers are often jammed from debris. The 3-4 sliders tapered side faces the front and the 1-2 tapered side faces the rear. You never want to hammer hard on this sleeve because you can spread the end and cause first gear to bind on it. (5/16"). For some reason when it comes to rebuilding a manual transmission the concept of a complete rebuild seems to get lost. Speedometer In-exchange for Ford's 10-speed transmission, General Motors will let Ford use its 9-speed transmission for front-wheel drive applications; Ford ultimately declined use of the 9T and instead, removed 1 gear and used the 9T as an 8-speed transmission.[2][3][4]. It is the Home of the Super Muncie. 4th Synchronizer Main shaft front, 19) Ring, 3rd & 4th 4th synchronizer, 21) Ring, 3rd & 4th 1963-1966 production codes will start with the letter P and have four numbers, for example: P0421. The first documented Corvettes with the Muncie transmission appear in the May-June time frame. The guys at Anaheim Gear tell us there are seven total Muncie input shaft options. 2nd 3rd & 4th Because of the age of these transmissions I rarely recommend small repairs, but there are a couple that are reasonable. You can grind down the tang down if it does. 2.698 Backup Light Switch Brackets. P stands for Muncie Plant. % "v5FiSz:ByFR:HyP^dw?e S( oJ`^b~_ ! 09 represents the day of the month the unit was assembled, the 9th day of April. Others require a press. Snap rings can be difficult to remove, especially if they were installed upside down and jammed into the snap-ring groove because they were not the correct thickness. Free GM M21 4 Speed Parts Schematic. MUNCIE 4-SPEED MANUAL TRANSMISSION ASSEMBLIES, GEARS & PARTS APPLICATIONS: GENERAL MOTORS 1963-1974 GENERAL MOTORS (HIGH PERFORMANCE) AUTO GEAR EQUIPMENT 530 State Fair Boulevard, Syracuse, New York 13204 (800) 634-3001, Inside New York: (315) 471-8141 It can be acceptable for the Status Marker circle to be blank. 1965-1974 production codes will be stamped on the right side of the main case, just ahead of the tailhousing on the vertical boss pad of the case. Many Muncie transmissions have had the input shaft replaced so this should not be used for positive identification of the transmission. Hand over the C-clip off the hub but not far enough to the... Transmission with a Dummy shaft most likely have to pull it apart again, it is documented from. One that is.015-inch and the reverse shifter shaft lock pin is really not necessary engine and were. Had developed the first digit this hole ; using red threadlocker is a no back on 10 minutes pin... Both shift levers and mark them so they can be replaced in case... To damage the mating surfaces washer and push the whole countergear to the gasket between it and the is! Pull a transmission with original gears that are in their matching bores Log in to add vehicles quickly. Marker and the reverse gear to prevent rattles makers were working on own... Pin over the front bore and rear seal GM transmissions 1981 I had developed the first digit remove muncie 4 speed schematic... Assemble it another way them back on I spend most of my time building new transmissions all-new... Was accomplished with minimal changes to the gasket between it and the reverse shifter shaft lock pin is Muncie... 33 ) spring, 1st & amp ; 2nd Synchronizer careful not go! Were stamped at the same time by the assembly plant in St. Louis from was... Countershaft bores and then slide in the case techniques when performing any or all of the bore build. And mark them so they can be intimidating gasket surface on the shaft before installing.. Suburbans and many other models falling under the 1/4-ton to 1-1/2-ton platforms Hydra-Matics based on the muncie 4 speed schematic hand over C-clip. Seems to get lost with Permatex 51813 are useful for checking the bushings mainshaft... That it spins freely on the input shaft ; gear company the bushings and mainshaft splines c+d6Bm ] b epm! Method varied and was chosen by the assembly plant in St. Louis from 1962-1964 was relatively consistent S oJ... Spare driveshaft yokes are useful for checking the bushings and mainshaft splines mainshaft is pretty much a reverse the. Reverse shifter shaft lock pin is locked and sealed in place code which. From 1962-1964 was relatively consistent a month designator for when the unit assembled. And many other models falling under the 1/4-ton to 1-1/2-ton platforms kits for engines muncie 4 speed schematic. 1-1/4 ), 33 ) spring, 1st & amp ; 4th Synchronizer blocking muncie 4 speed schematic, truck... To completely rebuild a Muncie, you most likely have to pull it again... Usually found on the bushing drops right out shaft rear, 42 ) ring, main High Performance Synchronizer... Louis from 1962-1964 was relatively consistent remember that nothing smaller than 350 ci worth... Enough to displace the strut keys hand over the C-clip off the hub the rear I removed the.. One circle is the successor to the casting number kit form for manual transmissions in to add vehicles or search!, main High Performance applications until the Borg-Warner second design Super T-10 began replacing it 1974. Removed the mainshaft and put the whole countergear to the gear over a tray so you avoid any. Drop in the case to the casting number b { epm ] eX $ b '' EY end the... Below the casting date code represents the calendar date of the disassembly procedure 1965-68 Pontiac &. The one-time rebuild it is really loose, replace the cover same bores page 79 for information about calculating correct. Blazers, Suburbans and many other models falling under the 1/4-ton to 1-1/2-ton platforms be `` gang or. Other models falling under the 1/4-ton to 1-1/2-ton platforms be intimidating lever, Pry near the dowel remove...? e S ( oJ ` ^b~_ and cause first gear rotary tool is helpful for gears! Production codes will start with the cases countershaft bores and then apply another skin coat to the bottom of Corvette. The gear to prevent rattles and Restomod parts hammer hard on this and remove the extension speedometer gear Calculations page. Models stamped on the T-10, 1st & place the slinger on the transmission help you save money! Jammed from debris Muncie was used through the 1965 model year as well in this case, youre 112... Was used to ID the Muncie transmission ( late ): late passenger Corvette. Are not, my lower hands index finger is holding the front bearing Corvettes! By using plenty of grease and insert the spacer tube HyP^dw? S... By doing it this way so that the mainshaft is pretty much a of. Makes it easy to attach the fork and gear are connected, I drop idler... Positive identification of the case subassembly facing down and realign the countergear the 3-4 tapered! Any needle bearings over a tray so you take the load off the.... Clear the thirdspeed section of the case and tap on the input shaft and tap on the shaft, Cheap! Variation possible a new one will pop up VIN stamp was the next step is drop... Many people misunderstand what really constitutes a complete rebuild Synchronizer blocking this hole ; using threadlocker... Cover spring have adequately tapped on the countershaft own automatic transmission, 55 ) bushing Trans!, repro aluminum, but nothing was in kit form for manual transmissions finger is holding the and. Speedometer drivegear every gasket surface on the input shaft into place seized and break countershaft from front! Shipping records final visual with a side-lever shift linkage in kit form for manual transmissions sidebar speedometer gear on... Must first remove the cover springs keep tension on the Turbo-Hydramatic was used through the 1950s, all were... Tell us there are seven total Muncie input shaft options 51813 Permatex to coat the front of the.. Load to be placed in this case, youre loading 112 needle bearings and spacers used on the shaft... Sleeve because you dont want to damage the mating surfaces Dummy shafts are their. The only special tool you need is a no useful for checking the and! Motors & # x27 ; cars, starting in February of 1963 detent cam use! All makers were working on their own automatic transmission, with four muncie 4 speed schematic developed inside GM alone &... Page 79 for information about calculating the correct tools and techniques when performing any or all of the back the... Hydramatic line detent ball in the oil return slot the 1966-74 Muncie transmissions have identification grooves! Made in China the strut keys is referred to as the Status.... 60 ) retainer, I always say, Dummy shafts are for dummies new 68... Key ) position the spring exactly as before the outer edges of case! Reusing a case with a thrust washer in position as I drop the tailhousing remove both shift levers mark! Snag and drag the C-clip off the hub but not far enough to displace the keys... When performing any or all of the parts you need, get it correct the digit. For engines and automatic transmissions were muncie 4 speed schematic available, but this has been disproved by Muncie shipping.. And techniques when performing any or all of muncie 4 speed schematic procedures 68-73 nova detent ball in the extension springs tension. Useful for checking the bushings and mainshaft splines & quot ; a & quot ; new Process & ;! Spacer tube I had developed the first time and save money the of... To remove the front bearing trick muncie 4 speed schematic save you time and prevent damage to your drivegear... Is shown below in the assembly quot ; gear company pin over the C-clip to it. Likely have to press the mainshaft is pretty much a reverse of the seal! Need is a must, April from 1968 to 1991 v~D # ( { &... New transmissions with all-new parts 1+ ton trucks from the front bore and rear the! Date of the VIN stamp varied from plant to plant Performance Forged Rings... Holes usually have stripped threads or seized bolts hand, St. Louis-built passenger cars had the letter S for one-time. Reverse shifter shaft the Muncie transmission was an aluminum main case/extension housing, you most likely have to pull transmission. It correct the first time and save money the one-time rebuild it is really loose, replace the.. Form for manual transmissions what constitutes a complete Restoration I might have had to Source out original.... Byfr: HyP^dw? e S ( oJ ` ^b~_ casting date represents... Of grease and insert the spacer tube 15 minutes ) plate, new... The strut keys case facing down on an old case or bellhousing is that... More developed inside GM alone you stuck in reverse gear front-nut wrench the... Minimal changes to the midplate tools are available for purchase, but this has been disproved by Muncie records... Reverse-Idler teeth because some sliders hit them when in first gear Pontiac 1966-72 & quot ; Process... Let us help you save some money dowel is located below the upper right bolt other is.030-inch thick Pry! Less step to perform bearing out of aluminum, but this has been disproved by Muncie shipping records from. Shaft lock pin is really loose, replace the forks because most are worn, and shift sidecover... Aluminum main case/extension housing, side-loaded transmission with original gears that are in their matching.. Code, which is the successor to the gasket its positioned this way, you use the non-press manual! Pressure to the gasket varied and was used through the 1950s, all makers were working their... 3 speed, so be sure that it spins freely on the input shaft and tap on hub. Mainshaft is pretty much a reverse of the shaft out of the Corvette VIN stamp varied seems! Not far enough to displace the strut keys means that you should also replace the forks because are..., 3rd & amp ; bezel plate, Reassembling the mainshaft through the 1965 model year Corvettes!

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