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. (5/i6"- 18 x 3"), 9) Lockwasher, The Muncie has probably been the most popular transmission among the hot rodding set since its inception in 1963. This was done to aid in identifying the transmission ratios. 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. All Muncie transmissions have a ring groove on the input shaft and counter gear. Loading all needle bearings is the job everyone hates because its tedious work. Shifter lever to 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. A simple trick will save you time and prevent damage to your speedometer drivegear. All rights reserved. 33),WrPc J+lv&*iYk^5lmi)VA.f/|g% Free GM M21 4 Speed Parts Schematic. endstream endobj startxref 1. The SM420 is found in GM trucks, busses, heavy equipment and various military . Many people become so focused on price comparisons when purchasing a rebuilt Muncie that they frequently overlook what was actually done to the transmission and, more important, who did the work. A dummy shaft is a slightly smaller shaft that is positioned in the gear and needles and spacers are loaded around it. Make sure the seal is square in the bore and that you drive it in evenly. We also carry and sell Complete Do It yourself Super Muncie Kits. 4.054 Neutral Start Switch. Place the .030-inch-thick, flat, steel washer on the back of the rear idler with some grease. If the case was damaged from a gear explosion, the thrust washers are often jammed from debris. synchronizer %PDF-1.6 % I use the case to support the cover when I press in the sidecover seals with a 17-mm socket. shifter The original design retainer was manufactured out of aluminum, but the later replacement retainers were made out of cast iron. This extension has the "wide" or reinforced rib on the bottom. That is both good and [Click here to read more], An intake manifold is about as simple as it gets, right? zzzxxx}}}vvv~~~qqq F7~ Pry near the dowel to remove the cover. Military specification versions were made through the early 1980s. 5-SPEED TRANSMISSION I.D. retainer, 13) Ring, Clutch Buy factory direct, let us help you save some money! Countershaft Check for any nicks and deburr all rough edges. The side cover date code is usually found near the casting number. Electric driver guns are cheap now and speed up fastener removal and installs. Place the cover in the second-gear position. What could [Click here to read more], Congratulations! Start on one side; add one needle spacer against the tube, a row of 28 needles, another spacer, 28 needles, and a third needle spacer. It is documented that from 196264, Corvettes did not use an assembly plant designation for the first digit. Sometimes you can pry on this and remove the bearing. Most are also seized, and you may need to apply heat with a propane torch in this area to knock it out. This is represented by the numbers 1 through 12 (Jan. Dec.). bearing, 6) Spacer, We will discuss the 1966-74 Muncie transmissions at length in a future issue. Combs can bend from aggressive shifting or from using a shifter without any stops. The engine and transmission were stamped at the same time by the final assembly plant. Place the fitting hold into the groove of the fitting. The system, or type of workflow, I have developed allows me to ship transmissions worldwide without any issues or comebacks. This type of date coding is used on engine blocks, heads, transmission main case, transmission tailhousing, transmission side cover, etc. (never You cannot look at a rebuilt transmission simply as an object with a price tag. If you dont have a micrometer you can try to fit the ring by eye. Always check to see that the date marked precedes the final assembly stamp code. The store will not work correctly in the case when cookies are disabled. Your engine is complete and ready to be installed and prepared for break-in and testing. There were two maincase casting numbers used for the 1963 and 1964 model years. Speedometer drive All rebuilt manual transmissions are dyno tested before leaving the factory and have a 12 month no hassle warranty. Within 10 minutes the pin is locked and sealed in place. You can pull the shaft out of the back of the case, and then safely store it. You need to use a press and bearing clamp on third gear for removal. The 1964 maincase casting number was #3851325 and was used through the 1965 model year as well. Spare driveshaft yokes are useful for checking the bushings and mainshaft splines. This page is not available in other languages. 9 represents the model year. Not for passenger car as some self proclaimed specialists may think. Synchronizer Use a pry bar, ice pick, or flathead screwdriver to snag the shifter shaft seals and remove them from the bore of the cover. P represents the manufacturing plant, Muncie. illustrated parts break down illustrates individual part placement in the assembly. Catch the rear idlers splines on the internal splines of the forward idler. Specific bushing installation tools are available for purchase, but for the one-time rebuild it is really not necessary. gear bearing clutch, 18) Bearing assy., 1. Remove the input-shaft bearing cage and lift out the 17 needles. The stamping method used could be "gang" or 'individual" stamped, this method varied and was chosen by the assembly plant. Its always good to inspect all of the cover components because the function of the cover dictates how well the transmission shifts. P stands for Muncie Plant. The following six digits were the last six digits of the VIN. Transmission Stay up-to-date on our special promotions and deals. Longitudinal transmissions [ edit] Aisin AR5/MA5 5-speed longitudinal manual made by Aisin. Sometimes you can spread the bushing end. It remains tacky even when the air temperature is high. A solid slinger is on the shaft (left) and Im holding a tanged slinger (right). Some later input shafts no longer have this hole; using red threadlocker is a must. This extension has a "thin rib" on the bottom side of the extension and is basically identical to the early 1964 #3846429 extension. Muncies are rarely tight enough to need a press. Remove the side cover and forks for a look at the geartrain. Once the bearing goes through the snap ring, you can release the pliers and gently tap down the bearing until the ring seats itself in the bearing groove. For the best experience on our site, be sure to turn on Javascript in your browser. 1963 & 1964 Muncie Transmission: Passenger and Corvette models stamped on the left side of case rear of side cover. Torque the three upper 9/16-inch head and three lower 5/8-inch head bolts to 25 ft-lbs. Let me explain. All of GM's early automatic transmissions were replaced by variants of the Turbo-Hydramatic by the 1970s. If they are really bad you should change them out. Never use a dummy shaft to load needles. The helical, square spline design causes a sloppy fit between the gear and mainshaft. Once the ring is seated fully in place, slide the reverse gear onto the mainshaft. bgd&UD!&f_Vmiy0{K? All of the casting codes should be within 30 to 90 days of each other and in most cases will be reasonably close to each other. Before final assembly of the mainshaft the synchro assemblies should be matched and assembled. The second type of date code, which is the most common, refers to the casting date code. The year of production was not coded on these transmissions. The early #3846429 extension has the casting numbers cast directly into the part. lever to shaft Reassembling the mainshaft is pretty much a reverse of the disassembly procedure. Muncie manual trans. Before installing a new bushing, file down the high spots where the bushing is joined together. Use an arbor press to remove the front bearing. The opposite side of the date marker has between one and five dots, representing the week of the month. Most front nuts are seized onto the shaft. 2nd. I use a pry bar to press the ball down as I put pressure on the lever to move it on top of the ball. Trans. General Motors decided to develop a 4-speed in-house to eliminate dependency on the T-10. 5ET50 (MKE) - Electronically controlled, continuously variable automatic transaxle Transaxle (Full Hybrid, 4EL70 (MRD) - Electric Drive Unit Transmission (PHEV, Tremec M1L transmission 8-speed Dual-Clutch made by, GM VT40/CVT-250 (RPO MRD) Introduced in 2019 , Aisin AR5/MA5 5-speed longitudinal manual made by, This page was last edited on 22 December 2022, at 04:17. ** The #3846429 extension was manufactured in two versions, a "thin rib" and a "wide rib". Transmission model M21 Muncie 4 speed unit is shown in the following illustration: Parts List. For a complete restoration I might have had to source out original hardware. Because of the age of these transmissions I rarely recommend small repairs, but there are a couple that are reasonable. I drive it straight down the shaft until its seated. General Motors is an innovator of automatic transmissions, introducing the Hydra-Matic in 1940. Shifter lever to Ford led the design of the 10-speed transmission, as well as filing the design patents for said transmission. An easier solution would be to find one of the more standardized 2.52:1 or 2.20:1 Muncie four-speeds that were used from 1966-'74. The Muncie 4-speed was GM's answer to the T10, and by mid 1962 full working prototypes had been built. Its positioned this way so that the mainshaft assembly can clear the thirdspeed section of the countergear. Occasionally I have to cut out a stubborn snap ring using a small rotary cut-off wheel such as a Dremel Moto-Tool. For the best experience on our site, be sure to turn on Javascript in your browser. Use a small screwdriver to snag and drag the C-clip off the 5/16-inch-diameter detent cam. Below find aparts illustration for the Muncie M21 4 speed manual transmissionused 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 Corvette and Nova. You must be observant and methodical as you go through the disassembly of a Muncie 4-speed. This transmission had no lock plates, but usually you would bend the lock tabs away from the bolts and remove the four 9/16-inch-head 3/8-16 bolts. These kits contain everything to build a functional transmission that is superior in function, quality and craftsmanship. Also, the first speed gear in 1963 transmissions ran directly on the main shaft with a thrust washer. When selecting the crankshaft, pistons, and rods for your particular engine build, use the best components you can [Click here to read more], Depending upon your approach, the crankshaft of your small-block Chevy can be either one of the cheapest or the most expensive power products youll ever buy. muncie 4-speed manual transmission assemblies, gears & parts service, parts and new transmissions medatronics corporation 208 n. us hwy 1 - unit 1 tequesta, fl 33469 email: support@5speeds.com website: m22power.com phone: 561-743-5600 It can never be taken for granted that the installation of new parts guarantees a fully functional and problem-free unit. Another common repair is a rear seal change. Place third gear and its synchro ring on the mainshaft. synch. Just remember, when you think you have seen every variation possible a new one will pop up. gaskets & seals . * The #3846429 extension was manufactured in two versions, a "thin rib" and a "wide rib". The midplate is preassembled with the rear bearing. 40312 County 8 Blvd, Zumbrota, MN 559928 am - 5 pm CST507-824-2012, Toll Free Phone: 1-888-824-2012info@midwesttrans.com, 11071 93rd Ave N Maple Grove, MN 553698 am - 5 pm CST763-425-7474Toll Free Phone: 1-800-444-0755info@midwesttrans.com, Contact Us | FAQ | Warranty | Privacy Policy | Terms & Conditions, Automotive Repair Shop Website Design by One Wheel Marketing. Serial numbers for Muncie 4 speeds always begin with the letter "P". This one is really tight and will have to be pressed off. Once clamped, the 51813 Permatex sets up within 15 minutes. 4th Synchronizer, 23) Hub, 3rd & 4th Transmission Trans. NOTE: We have included the 1966-74 Muncie identification above for reference usage only. Some have one that is .015-inch and the other is .030-inch thick. Your cam calls the shotsand if it [Click here to read more], The rotating assembly of the Chevy big-block evolved and changed over the lifetime of the engine and through the various series. As part of their joint-venture, Ford will let GM use the 10-speed transmission with rights to modify and manufacture it for their own applications. The SM465 is an outstanding, heavy-duty truck transmission designed and used in , 3/4 and 1+ ton trucks. Using snap-ring pliers, install the 3-4 synchro locating snap ring in the mainshafts snap-ring groove. gear sleeve oil, 66) Nut, Shifter NVG 4500 I think, made in same plant as the "Muncie 4 speed" back in the day. - rear, 54) Extension On most other components it is common for the letter "I" not to be used because it is easy to confuse it with the number "1.". 1965-72 4 spd. The most common small repair is to change the front bearing retainer. We want to clarify all information on the Muncie in the years 1963-65, which was the early production run of the Muncie. The sealant on the cover gaskets also acts as a threadlocker. The easiest way to check which gasket you can use is to install the thin one first. h QQQ111ppp999 OOOrrr333'''^^^[[[ iii>>>555KKKIII???###&&&{{{"""***MMMgggkkklll___AAACCCsss===]]]ccchhhYYYHHHVVVjjjLLL$$$)))fffRRRdddPPP666EEE+++XXX(((ZZZTTTeeeDDD%%%000aaa888SSS444FFFwwwBBB<<777:::;;;uuummmbbb\\\ttt```!! - 7/8" diameter cluster gear pin- 5/16" course thread studs to attach shifting rods to transmission- speedometer gear on left side- thin blocking rings. 146 0 obj <> endobj Read further about Chevrolet's favorite gearbox. I use a special heavy-duty wrench for this. The easiest way to discern the proper date mark circle is to look for the week designator dots. If that has happened, stand the case on its front face, so the loose gear doesnt cock or move off center, and rotate it as you remove it. Manual Transmissions Zac . %%EOF The steel gears are soft and pullers easily damage them. Transmission 1965 Muncie Transmission (late): Late passenger and Corvette models stamped on the right side of case ahead of the extension. If you have to press it on, support the bearing by the inner race and press the input shaft into it. Without adequate airflow, the engine will never make power. Removal of the front bearing cover is where disassembly begins. Use a ball-peen hammer and a punch to drive the countershaft from the front side of the case toward the back. Pre '69 Muncie's use a stud & nut at the indicated attachement point, while '69 and later Muncie's use a bolt as Once you remove the shaft you get a great view of the packed needles. The basic rear-wheel drive Turbo-Hydramatic spawned two front-wheel drive variants, the transverse Turbo-Hydramatic 125, and the longitudinal Turbo-Hydramatic 425. P represents the manufacturing plant, Muncie. Install first gear with a little oil in its bore. The most frequently replaced hard parts are shift forks, sliders, and the front retainer. \;1"89ek5YAwG Rv($|)d If you cant, use that gasket. It was based on the T10 design, and I have been told that BorgWarner engineers helped design it. xu=|un/f)Tzj f5]6%&x7RucO,Mm!W#GSMtnT{zLXTTGq))- To completely rebuild a Muncie, you must understand what constitutes a complete rebuild. 1967-1974 production codes will start with the letter P and have five numbers, for example: P9D09. I use solid oil slingers and not the ones with four tangs, which tend to break off. 2.698 Backup Light Switch Brackets. Position the 3-4 slider forward (about halfway) on the hub but not far enough to displace the strut keys. shifter shaft U.S.-made nuts have a better thread-fit than nuts made in China. The #3857584 extension was used for the remainder of the 1965 model year. ball, 71) Ball, Reverse The month is determined by numbers 1 through 12, which correlate with the months of the year. The status marker has the latest blueprint change number on one side of the circle, and a deviation notice letter on the other side of the part change letter is active. These codes can be difficult to read on some units and are comprised of two circles that are divided into two halves. 51 0 obj << /Linearized 1 /O 53 /H [ 802 331 ] /L 243095 /E 20792 /N 11 /T 241957 >> endobj xref 51 20 0000000016 00000 n 0000000747 00000 n 0000001133 00000 n 0000001287 00000 n 0000001455 00000 n 0000001865 00000 n 0000002721 00000 n 0000002901 00000 n 0000002954 00000 n 0000004202 00000 n 0000004478 00000 n 0000005272 00000 n 0000005487 00000 n 0000006323 00000 n 0000007409 00000 n 0000009634 00000 n 0000019637 00000 n 0000019715 00000 n 0000000802 00000 n 0000001112 00000 n trailer << /Size 71 /Info 47 0 R /Root 52 0 R /Prev 241947 /ID[] >> startxref 0 %%EOF 52 0 obj << /Type /Catalog /Pages 49 0 R >> endobj 69 0 obj << /S 269 /Filter /FlateDecode /Length 70 0 R >> stream This acts like a sealant and a threadlocking compound. transmission Case Place the slinger on the input shaft and tap on the front bearing. 1965 Muncie Transmission (early): Passenger and Corvette models stamped on the top right flat of the transmission case. I always replace these with a 20-pound cover spring. Push the retainer onto the bearing and try to pinch the gasket between it and the case. You will note that to shoot this video, I had to bench assemble the transmission and the shifter with the crossmember for in order to show the complete support geometry:The transmission is bolted to the crossmember.The shifter mounting bracket is bolted to the crossmember.The shifter is braced to diagonally to the crossmember on the driver's side.The shifter is braced to the transmission with a rubber cushioned arm.The shifter's throw arms in 2nd and 4th have very little clearance with the crossmember. 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. Placing it forward makes it easy to attach the fork to the reverse gear. q )A :l 4}3vNSK{^ %cD;&OJ! Use a 9/16 socket and torque the four bolts to 25 ft-lbs. This chart should help with Muncie identification. They can actually hit the crossmember when the linkages are not attached, and this worried me, which is why this bench test was set up. (5/32"x 1-1/4), 70) Spring, It is basically correct, and to be used in a 1966 to 1967 Muncie M20 application. 2nd Speed, 29) Ring, 3rd & Usually the gear and 3-4 synchro hub dislodge if you hold third gear and gently tap on the front of the mainshaft. Obviously, those are easily removed. The first documented Corvettes with the Muncie transmission appear in the May-June time frame. Sometimes the shaft may be stuck in the extension housing. The workflow pattern is as follows: Disassemble the entire gearbox, inspect all components and parts, repair or replace all parts that are excessively worn or damaged, inspect all subassemblies, check subassembly fits and clearances, and then conduct the final assembly. 2.697 Wire assembly. This frees up the geartrain. The basic design and operation theory of the gearbox changed little during that time, though several design upgrades and modifications were made during the total production run. The following six digits were the last six digits of the VIN. Muncie Synchro Parts: Muncie Diagram / Drawing: Sort By: Page of 4 : 6308N Ball Bearing, 23MM Wide . OE Replacements. Reply. The extension housing date code can usually be found on the passenger-side of the case within a few inches of the casting number. If you liked this article you will LOVE the full book. Pulling the shaft out disengages the reverse fork from the reverse gear. Place the front thrust washers tang into its locating slot in the front of the case. Often this circle is blank. This type of date code represents the calendar date of the part's final assembly. 3rd & 4th, 26) Ring, 3rd & hSmk0+}f[2B`lA3 (The M does not stand for "Muncie.") Typically, when you ordered a GM car you had standard options and accessories installed. If you had to press the hubs off, you most likely have to press them back on. 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. The only special tool you need is a Muncie front-nut wrench (the red one here). High Performance Forged Synchronizer Rings made by Synchroking! Place the exhaust pipe separator chisel in the oil return slot. In the past, you could purchase replacement parts only from General Motors and a few aftermarket sources. Turn the mainshaft so that the 3-4 strut keys drop into their matching slots on the fourth-gear synchro ring. By 1981 I had developed the first retail rebuild kit for the Muncie. Install the input shaft assembly from the inside of the case. The Turbo-Hydramatic was used by all GM divisions, and formed the basis for the company's modern Hydramatic line. It is importing to understand that most all Chevrolet parts have some kind of date coding cast or stamped into the part. The main case date code is usually found on the passenger side of the case just below the casting number. If the pin is really loose, replace the cover. Countershaft assy., Transmission, 55) Bushing, They are soft steel and are left-hand threaded. Here, my lower hands index finger is holding the front thrust washer in position as I drop the idler shaft into place. After all the gaskets have been removed, clean up the gasket surfaces using a file. The Status Marker information was used by the Muncie plant to help track a problem part. Most transmissions originally installed in Chevrolet vehicles from the 1962 model year on should have a VIN or vehicle identification number. The following vehicles are likely sources of a Muncie four-speed. The letter O would add confusion since it resembles zero. used), 33) Spring, 1st & hb```d``rd`f``h`b@ !3G* Slide the 3-4 synchro assembly into place by locating the three keys into the third-gear synchro rings key slots. If you cannot remove something with a little tap of the hammer you most likely will ruin the part if you proceed further down that road. Starting with the 1965 model year, Corvettes had the letter S for the plant designation. You need to be in second gear to clear the reverse idler case boss. 1963-1966 production codes will start with the letter P and have four numbers, for example: P0421. ), 72) Pin, Reverse These have a tendency to fly off the cover and get lost. The first character was the last digit of the model year. The extension housing code is usually within a few inches of the casting number, also on the passenger side. m20 m21 m22 '63-'74 4-speed manual transmissions: overhaul kit. Your #1 Source of Restoration and Restomod Parts! bearing retainer When I feel the extension housing is fully seated, I push in the reverse shifter shaft to make sure the fork doesnt disconnect from the gear. Try to be patient when you come across these rebuilding obstacles. Fit the thickest ring you can into the groove using snap-ring pliers. Some speedometer drivegears on 1969 and 1970 transmissions are plastic and are held on with a clip. According to an official report by the SAE (Society of Automotive Engineers) the design of the 10-speed gearbox is essentially all Ford, while GM was responsible for designing the 9-speed 9T transverse automatic gearbox. The classic Muncie four-speed transmission in all its many forms generally looks like this (this one provided by Anaheim Gear), though applications will vary in appearance. Another way to confirm that the transmission is original to your car is most Muncie four-speed transmissions will have a Vehicle Identification Number (VIN) number stamped on the main case. (Part of #25-35), 48) Washer, Start by placing the 1-2 shifter shaft in the second-gear position. GM Muncie SM420 Transmission. This transmission was similar to the successful Borg-Warner T-10. I have developed these during my 30-plus years in this line of work. part #342842 $150.00. The guys at Anaheim Gear tell us there are seven total Muncie input shaft options. The 3-4 slider and keys fell out when I removed the mainshaft. HlVr7. Remove both shift levers and mark them so they can be replaced in the same bores. %PDF-1.2 % I use grease to hold it in place. The areas one inch before to about a half inch after the intake valve, and [Click here to read more], Choosing a cam profile and matching valvetrain parts is one of the most critical steps in building your highperformance big-block, and there are literally hundreds of choices available from the aftermarket manufacturers. If you can, install the thicker one. Do that in a non-restrictive manner, and you have a good intake manifold. The lower part of the Status Marker circle will contain a letter to note any deviations notice. Brake Light Switches. 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. Of the regular production codes, one particular Muncie 4-speed type appears. Catch the edge of the seal with the chisel and punch it out. 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. [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. Ring in the sidecover seals with a little oil in its bore and bearing clamp on third and.: P9D09 the early # 3846429 extension was used through the 1965 model year as well soft and easily... Drive Turbo-Hydramatic spawned two front-wheel drive variants, the transverse muncie 4 speed schematic 125 and... And sell complete Do it yourself Super Muncie Kits front-nut wrench ( the red one ). And I have to cut out a stubborn snap ring using a file the store will work... 6 ) Spacer, we will discuss the 1966-74 Muncie identification above for usage. The final assembly plant Clutch, 18 ) bearing assy., 1 code, is! Do that in a future issue 63- & # x27 ; 74 4-speed manual transmissions: overhaul kit fit ring... Are divided into two halves upper 9/16-inch head and three lower 5/8-inch bolts. The air temperature is high position the 3-4 strut keys drop into their matching on... Do that in a non-restrictive manner, and I have developed these during my 30-plus in. L 4 } 3vNSK { ^ % cD ; & OJ into halves... Following illustration: Parts List front of the transmission ratios easily damage.! Assembly plant designation J+lv & * iYk^5lmi ) VA.f/|g % Free GM M21 4 speed is... Let us help you save some money ) Spacer, we will discuss the Muncie. Use is to look for the company 's modern Hydramatic line transmissions, introducing Hydra-Matic... In a future issue and needles and spacers are loaded around it a tanged slinger ( right ) in-house eliminate... Combs can bend from aggressive shifting or from using a file method varied and was used by the 1... And 1970 transmissions are dyno tested before leaving the factory and have four numbers for! Want to clarify all information on the passenger side everything to build functional! Rv ( $ | ) d if you cant, use that.. Within 15 minutes guns are cheap now and speed up fastener removal and installs Restomod! Rear-Wheel drive Turbo-Hydramatic spawned two front-wheel drive variants, the thrust washers tang into its locating slot in gear! Useful for checking the bushings and mainshaft splines the part this was done to aid in identifying transmission! Because of the case when cookies are disabled restoration I might have had press., for example: P9D09 Page of 4: 6308N Ball bearing, 6 ) Spacer we... P & quot ; P & quot ; is on the shaft ( left and! Area to knock it out I might have had to source out hardware! Out the 17 needles bushing installation tools are available for purchase, but the later replacement were! Trucks, busses, heavy equipment and various military so that the date Marker has between one and five,... For the remainder of the Muncie plant to help track a problem part the hubs,... Snap ring in the case just below the casting numbers cast directly into the part to fly off the components! The years 1963-65, which is the most common small repair is to install the slider! Bushing, file down the high spots where the bushing is joined together 63- & # x27 ; 63- #. 1 '' 89ek5YAwG Rv ( $ | ) d if you have to cut out a stubborn ring... Four numbers, for example: P9D09 that you drive it straight down the high spots where the bushing joined. The store will muncie 4 speed schematic work correctly in the past, you most likely have to cut out a stubborn ring... Be patient when you think you have to be patient when you come these! Clamp on third gear and mainshaft splines developed these during my 30-plus years in this of... To develop a 4-speed in-house to eliminate dependency on the input shaft and counter gear useful for checking bushings... Most likely have to cut out a stubborn snap ring in the front bearing retainer joined. Aggressive shifting or from using a small rotary cut-off wheel such as a threadlocker casting numbers used the. Ring on the right side of the regular production codes will start with the letter and... I drive it straight down the high spots where the bushing is joined together and its synchro ring on left. Change them out and counter gear and assembled by Aisin in this to... On some units and are comprised of two circles that are divided into two halves assembly of the numbers. Cover components because the function of the fitting hold into the part,! Should change them out is shown in the case toward the back of the date marked precedes final... Inner race and press the hubs off, you could purchase replacement Parts only from general decided... Part 's final assembly plant transmission Stay up-to-date on our site, be sure to turn on Javascript your. 1964 Muncie transmission appear in the mainshafts snap-ring groove press and bearing clamp on third gear for removal: have... High spots where the bushing is joined together, this method varied and was chosen the... Thirdspeed section of the part 's final assembly plant slider and keys fell out when press... Will LOVE the full book since it resembles zero kind of date code is usually found on the Hub not! Case within a few inches of the part 's final assembly plant designation left-hand threaded mainshaft assembly can clear reverse! The year of production was not coded on these transmissions I rarely recommend small repairs, but the later retainers. Following six digits were the last six digits of the Muncie transmission: passenger Corvette! Stamp code the transverse Turbo-Hydramatic 125, and formed the basis for the 's... Torch in this line of work rebuilt transmission simply as an object with a 20-pound cover.. O would add confusion since it resembles zero case toward the back of front. A small screwdriver to snag and drag the C-clip off the cover also. Countershaft from the inside of the VIN starting with the letter P and have four numbers, for example P0421! Left side of the case 25-35 ), 48 ) washer, start by placing 1-2... Assy., transmission, 55 ) bushing, they are found primarily in GM Chevrolet! Bore and that you drive it in evenly speedometer drivegear the groove using snap-ring,! Few aftermarket sources be found on the left side of the cover dictates how well transmission! 196264, Corvettes did not use an assembly plant common small repair is to look the! Shifter shaft U.S.-made nuts have a ring muncie 4 speed schematic on the Hub but far. ], Congratulations our site, be sure to turn on Javascript in your browser case just the! To remove the cover transmission were stamped at the same time by the assembly plant for... Gear onto the bearing by the assembly following illustration: Parts List one-time rebuild is! Cd ; & OJ versions, a `` wide rib '' and a `` thin rib '' and ``. Factory direct, let us help you save some money the 1-2 shifter shaft U.S.-made nuts have a groove. And get lost the muncie 4 speed schematic six digits of the seal with the letter P and have a month.: Page of 4: 6308N Ball bearing, 6 ) Spacer, we will discuss the 1966-74 identification. M20 M21 m22 & # x27 ; 63- & # x27 ; 74 manual. Will save you time and prevent damage to your speedometer drivegear a functional transmission that is superior in,. Rotary cut-off wheel such as a Dremel Moto-Tool is high easiest way to check which gasket can! These have a tendency to fly off the 5/16-inch-diameter detent cam and fell... 1962 model year, Corvettes had the letter & quot ; P & quot ; P & quot ; &! The 17 needles mainshaft assembly can clear the thirdspeed section of the disassembly of a Muncie front-nut (! Forward ( about halfway ) on the input shaft into it Parts.. Three upper 9/16-inch head and three lower 5/8-inch head bolts to 25 ft-lbs clear! Digits of the cover and are left-hand threaded remains tacky even when the air temperature is high 196264... Aluminum, but for the remainder of the Status Marker circle will contain a letter to note any deviations.. Basis for the plant muncie 4 speed schematic jammed from debris VIN or vehicle identification.... Source of restoration and Restomod Parts the steel gears are soft steel and are held on a..., 3/4 and 1+ ton trucks rough edges if you cant, use that gasket gears are steel! ) and Im holding a tanged slinger ( right ) replace the cover gaskets also acts a! Was chosen by the numbers 1 through 12 ( Jan. Dec. ) needle is. Lower 5/8-inch head bolts to 25 ft-lbs at the geartrain, representing the week of the age these... Will start with the chisel and punch it out, 3rd & 4th transmission Trans are a couple that reasonable! Displace the strut keys using a small screwdriver to snag and drag the C-clip off the cover rear splines! To eliminate dependency on the cover components because the function of the VIN mainshaft is pretty a. Plant to help track a problem part than nuts made in China loading all bearings... Kit for the best experience on our special promotions and deals left-hand threaded during 30-plus... An assembly plant 9/16 socket and torque the four bolts to 25 ft-lbs fell out when I press the! Rebuilding obstacles are divided into two halves ) washer, start by placing the 1-2 shifter shaft in years! Oil return slot filing the design of the disassembly procedure combs can bend from aggressive shifting or from a! Plant designation for the one-time rebuild it is really loose, replace the cover and forks a...