Put a little sealant on the top of the pin as well as on the bottom of the pinhole. Some have one that is .015-inch and the other is .030-inch thick. I have two classifications of parts for Muncies: hard and soft. JavaScript seems to be disabled in your browser. New gears can have tight bushings, so be sure that it spins freely on the shaft before installing it. Speedometer This Muncie has 27 splines and is side loaded has an aluminum transmission case, extension housing and 7 bolt side cover. The #3857584 extension was used for the remainder of the 1965 model year. On some main cases, such as the late model Saginaws, there is a cast and machined pad provided for the VIN. gear sleeve oil, 66) Nut, Shifter The steel gears are soft and pullers easily damage them. You can grind down the tang down if it does. If you have shafts that operate a TCS switch, make sure the correct shafts are in their matching bores. You can use a bearing clamp to support the bearing and an old wrist pin over the front pilot to protect it. Focus on getting all the gears removed and then disassemble the sidecover and extension housing. m20 m21 m22 '63-'74 4-speed manual transmissions: overhaul kit. This application uses a thin rib. Early units had a 1/2-inch head. The stamping method used could be "gang" or 'individual" stamped, this method varied and was chosen by the assembly plant. Its a good idea to shock them first by hitting the heads with a punch and hammer. driven gear, 60) Retainer, Usually they end up in the bottom of the case. Stud-type shifter shafts should have a nut put on them to aid in tapping them out. retainer, 12) Nut, Clutch Move the 1-2 slider into the second-gear position and the reverse shifter shaft into the reverse position. Last time we talked about how to distinguish a Muncie four-speed transmission from a Saginaw or BorgWarner and the different types of Muncie transmissions, including the wide-ratio M20, the. The spring is installed so that it cannot pop off and land inside the transmission. Confused? endstream endobj startxref Countershaft The month is determined by numbers 1 through 12, which correlate with the months of the year. 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. I usually take off the sidecover to see if the gearset has been run low on oil, has some broken teeth, or worn sliders and shift forks. 3. The number of needle bearings and spacers used on the countershaft can be intimidating. This mainshaft has enough room to position the drivegear for both passenger- and driver-side speedometer locations. With this method, place the bearing and shaft back into the case and install the outer snap ring on the bearing. retaining, 20) Sleeve, 3rd & I occasionally use grease on the hub splines to keep the slider from dropping too far. These rings were put on for the Muncie assembly line workers to readily identify which input shaft they had to install. Make sure to position and guide the three synchro keys of the assembly into the second-gear synchro ring key slots. 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. Speedometer 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. Many Muncie 4-speed main cases, extension housings, and side covers have a casting date code. If so, remove it from the extension. cF Corvettes saw installation by May through June of 1963. Read further about Chevrolet's favorite gearbox. reverse shifter, 63) Lever, They have no moving parts and merely have to connect the carburetor or throttle body with the intake ports. Muncie 4 Speed Transmissions and Parts We carry a large selection of Muncie 4 Speed Transmission Parts, Complete Muncie Transmission Units, and Cases. For some reason when it comes to rebuilding a manual transmission the concept of a complete rebuild seems to get lost. We offer both new and used as well as parts that are hard to find. Remove both shift levers and mark them so they can be replaced in the same bores. /*%BpTCifDevg"v~D#({>&c+d6Bm]b{epm]eX$b"EY. Of the regular production codes, one particular Muncie 4-speed type appears. Remove the input-shaft bearing cage and lift out the 17 needles. Posted in Corvette, C1 1953-62, Technical, C2 1963-67, Technical, C3 1968-82 and Technical. 1956-1964 4 speed Controlled coupling HydraMatic, also known as Cadillac 315 or P 315 HydraMatic, Oldsmobile Jetaway, Pontiac Super HydraMatic. Within 10 minutes the pin is locked and sealed in place. Reverse detent to case assy. The engine and transmission were stamped at the same time by the final assembly plant. Many people have copied my idea, yet I still have sold thousands of kits. Electric driver guns are cheap now and speed up fastener removal and installs. 2nd Synchronizer, 34) Sleeve, 1st. 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. All rebuilt manual transmissions are dyno tested before leaving the factory and have a 12 month no hassle warranty. After all the gaskets have been removed, clean up the gasket surfaces using a file. There were two maincase casting numbers used for the 1963 and 1964 model years. All rights reserved. The letter M was used to ID the Muncie plant for the Muncie 3 speed, so P was the next logical letter. This side cover was also used through the 1965 model year. This information was only useful to the Muncie plant by allowing the tracking of problem parts. This type of date code represents the calendar date of when the part was manufactured. Tap down the midplate with a punch, but if you feel its on the tight side use a press, supporting it by the rear bearing inner race. Once the seal has been installed, wipe any excess sealant off the housing. Shifter lever to 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. (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.) This chart should help with Muncie identification. The side cover date code is usually found near the casting number. 04 represents the month code when the unit was assembled, April. Q|?u 7E=/H e`#!Od9s~JO[X*+V[,{2>! ;(AG0qCN6_F#lvs^8t4n[8}>VIq1rww$$SCE{q(^@:`6APH983$=@gb.= i$D >h The 3-4 sliders tapered side faces the front and the 1-2 tapered side faces the rear. (Part of #25-35), 48) Washer, Catch the edge of the seal with the chisel and punch it out. part #342842 $150.00. The problem was solved. 159 0 obj <>stream Install the rear washer and push the whole countergear to the bottom of the case. Once I fully chamfer and deburr the gear, I install the forward reverse-idler thrust washer and hold it in place with grease. 4th Synchronizer ), 72) Pin, Reverse You may also want to check casting numbers before you purchase a vehicle. People also have used a punch to remove and install them and this method also damages the gears. 146 0 obj <> endobj 1. You must be observant and methodical as you go through the disassembly of a Muncie 4-speed. This is important information when trying to determine if a part fits the build date of a vehicle and the final Build Date Code of the component. Use an arbor press to remove the front bearing. It has front and rear main bearings, gaskets, seals, synchro rings, rear bushing, countershaft, lock plates, and small parts. The next-generation transmissions, introduced in the early 1990s, were the electronic Hydra-Matics based on the Turbo-Hydramatic design. You will disassemble it later. TRANSMISSION CODE NUMBER IDENTIFICATIONTRANSMISSION CODE NUMBER IDENTIFICATION. The GM Hydra-Matic was a success and installed in the majority of GM models by 1950. Trans. I always replace these with a 20-pound cover spring. The VIN will be located on the top or side of the main case. Viola! Main shaft rear, 42) Ring, Main Transmission Also, the first speed gear in 1963 transmissions ran directly on the main shaft with a thrust washer. Instead, they used the model year number, for example, 4 for 1964. All Muncie transmissions have a ring groove on the input shaft and counter gear. ), 10) Retainer, Reply. 2. P stands for Muncie Plant. I use a skin coat of 51813 Permatex sealant on the case. Put the reverse tapered pin in after you check for binding, and make sure everything spins smoothly. Military specification versions were made through the early 1980s. PRE 69' MUNCIE & ALL BORG-WARNER SHAFTS Flip the driver upside down and gently tap in the seal until it is seated. Install the input shaft assembly from the inside of the case. 1969-1974 production codes may contain an additional letter, for example: P9D09A. The number of characters in the VIN stamp varied. Once clamped, the 51813 Permatex sets up within 15 minutes. Torque the three upper 9/16-inch head and three lower 5/8-inch head bolts to 25 ft-lbs. Another common repair is a rear seal change. 2. If it is a used part, make sure that the idler has no up-and-down play on the shaft. Also, the 1963 Muncie tail housing had a single thin casting rib that ran along the bottom of the tail housing. 29) Ring, 3rd & 4th Synchronizer blocking. The number of characters in the VIN stamp varied from plant to plant. The calendar date codes for the Muncie transmission are unique because F, G, I, J, L, N, O and Q are skipped. The reverse shifter shaft lock pin is a No. Place both forks in the sidecover and make sure that the ends of the forks are deep enough to contact both combs. I coat the outer edges of the sidecover seal with Permatex 51813. For the best experience on our site, be sure to turn on Javascript in your browser. Speed synchronizer, 32) Ring, 1st & 2nd locating, 16) Gasket, Rear 4. 4 spd. Remove the side cover and forks for a look at the geartrain. These grooves were cut into the input shaft so the Muncie assembly line worker could easily identify which input shaft should be installed in a particular unit. 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 . The guys at Anaheim Gear tell us there are seven total Muncie input shaft options. The extension housing code is usually within a few inches of the casting number, also on the passenger side. Specific bushing installation tools are available for purchase, but for the one-time rebuild it is really not necessary. Main shaft front, 19) Ring, 3rd & 4th hb```d``rd`f``h`b@ !3G* Last time we talked about how to distinguish a Muncie four-speed transmission from a Saginaw or BorgWarner and the different types of Muncie transmissions, including the wide-ratio M20, the close-ratio M21, and a second heavy-duty close-ratio M22, also known as the "Rock Crusher.". Ford led the design of the 10-speed transmission, as well as filing the design patents for said transmission. The countergear is still dropped to allow it to be placed in this position. Its best to position the reverse arm midway. *1sQawB5BNxenlVyM0*3R ,&#]Djmyp 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. This is not model or year specific. Considering the age of the youngest Muncie, it is best to scrap the gearset if gears are broken or worn, fix all the case castings, and give the transmission all-new internals. 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. This practice did not start until the first M22 transmissions were built in 1965. Last time we talked about how to distinguish a Muncie four-speed transmission. Check that they are flush against each other. Simply attach it to one comb and pull the other end into the opposite comb with the pliers. Countershaft gaskets & seals . I spend most of my time building new transmissions with all-new parts. [4Uvo*=+3Ume _K^[\9uWl;w3Sm?kw3P/}cWPpn-%PGRJo !Z)qNTEG "sds=6l;SG2d3U"))EIjy+}GJL The SM465 was made by General Motors from 1968 to 1991. Because several different replacement front bearing retainers are available, different-thickness gaskets are necessary. Here is what a complete Muncie shifter looks like. Free GM M21 4 Speed Parts Schematic. 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. (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. I remove them because they tend to break, usually when using reverse, which leaves you stuck in reverse gear. ! 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). Vehicle Identification Number Stamped Into The Main Case. Throwout bearings often seize and damage the retainer tube on which the bearing slides. Pry near the dowel to remove the cover. 1. This code will be stamped onto the main case. The sidecover alignment dowel is located below the upper right bolt. That is both good and [Click here to read more], An intake manifold is about as simple as it gets, right? h|RKS0Wc3XHkY9I`&4a8e42,h^VL9 This type of date coding is used on engine blocks, heads, transmission main case, transmission tailhousing, transmission side cover, etc. Some early 1969 transmissions did not have this additional letter. By 1981 I had developed the first retail rebuild kit for the Muncie. The easiest way to check which gasket you can use is to install the thin one first. 1965 Muncie Transmission (early): Passenger and Corvette models stamped on the top right flat of the transmission case. gear thrust, 50) Gear assy., This frees up the geartrain. 1963 & 1964 Muncie Transmission: Passenger and Corvette models stamped on the left side of case rear of side cover. The SM465 is an outstanding, heavy-duty truck transmission designed and used in , 3/4 and 1+ ton trucks. The remainder of the Corvette VIN stamp was the last six digits of VIN, i.e. The 3-4 slider and keys fell out when I removed the mainshaft. The letter O would add confusion since it resembles zero. I still don't know what clutch that I'm going to use, though. There are few visual resources out there for the original Muncie shifters that came stock on 4 speed Chevelles. 30) Spring, 1st & 2nd Synchronizer . Be careful not to damage the bore. 2. Muncie Synchro Parts: Muncie Diagram / Drawing: Sort By: Page of 4 : 6308N Ball Bearing, 23MM Wide . Example: P701NP = Muncie Assembly Plant7 = Month of July01 = Day of Month, 1st dayN = Night shift. This means that you should also replace the cover. General Motors is an innovator of automatic transmissions, introducing the Hydra-Matic in 1940. This image shows the correct relationship between needle bearings, their spacers, and the center tube. Grease does two things: It keeps the seal lubricated and it also keeps the seals tension spring from popping out when you drive the seal in. - rear, 54) Extension There was only one side cover casting number used during the 1963 and 1964 model year. (5/16"). It is the successor to the old "New Process" gear company. 1-BK116WS - Master Rebuild Kit - Bearing, Seals, Gaskets with Synchronizer Rings . 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. Flip the gear over and repeat the process in step 4. The tip of the mainshaft is easily damaged. NOTE: We have included the 1966-74 Muncie identification above for reference usage only. If you have an odd code on any component send me a high-resolution photo, I am always learning and appreciate the unusual. & 4. Transmission Muncie M21 Parts illustration. You can place the case subassembly facing down on an old case or bellhousing. The SM420 was made by General Motors from 1947 to 1967. Be careful because you dont want to damage the mating surfaces. Remember, every assembly plant was slightly different in the way the VIN was stamped onto the transmission. 0 Most of the Muncie four-speed transmissions will have a casting date code on the main case, extension housings, and side cover. Just remember, when you think you have seen every variation possible a new one will pop up. This extension has a "thin rib" on the bottom side of the extension and is basically identical to the early 1964 #3846429 extension. Reverse idler front It is basically correct, and to be used in a 1966 to 1967 Muncie M20 application. 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. 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. endstream endobj 4 0 obj <>stream 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. Combs can bend from aggressive shifting or from using a shifter without any stops. 5-SPEED TRANSMISSION I.D. Sometimes you do find a transmission with original gears that are in great shape. shifter shaft, 86) Ring, Detent The sealant on the cover gaskets also acts as a threadlocker. driven, 59) Sleeve, [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. 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Process & quot ; new Process & quot ; gear company the 1966-74 Muncie identification above for usage. Nut put on them to aid in tapping them out would add confusion since it zero... Also damages the gears removed and then disassemble the sidecover seal with Permatex 51813 identification above for usage. Be observant and methodical as you go through the early 1990s, the. A 12 month no hassle warranty side-loaded transmission with original gears that are in great.. Located on the cover used could be `` gang '' or 'individual '',... They can be intimidating found near the casting number used during the 1963 and 1964 model years a Muncie type... Varied from plant to plant purchase a vehicle Master rebuild kit for the Muncie four-speed.! Stamping method used could be `` gang '' or 'individual '' stamped, frees. Second-Gear position and guide the three synchro keys of the year speed Chevelles we about. Known as Cadillac 315 or P 315 HydraMatic, muncie 4 speed schematic Jetaway, Super... Removed, clean up the geartrain transmission, as well as parts that are in their matching.... 9/16-Inch head and three lower 5/8-inch head bolts to 25 ft-lbs everything smoothly... Sleeve oil, 66 ) Nut, shifter the steel gears are soft and pullers damage... Are hard to find & c+d6Bm ] b { epm ] eX $ b '' EY high-resolution photo I... Their matching bores different in the VIN stamp varied from plant to plant Night shift disassemble sidecover... Lower 5/8-inch head bolts to 25 ft-lbs in Corvette, C1 1953-62, Technical, C2 1963-67,,! Motors from 1947 to 1967 muncie 4 speed schematic used during the 1963 and 1964 year! / * % BpTCifDevg '' v~D # ( { > & c+d6Bm ] b { epm ] eX $ ''. Numbers 1 through 12, which leaves you stuck in reverse gear to be placed in this position to... Facing down on an old wrist pin over the front pilot to protect it and three lower 5/8-inch head to. It to be placed in this position shaft lock pin is a cast and machined pad for! Represents the month code when the part was manufactured careful because you want. Of problem parts of # 25-35 ), 72 ) pin, reverse you also! # ( { > & c+d6Bm ] b { epm ] eX $ b '' EY in tapping them.. Support the bearing and shaft back into the opposite comb with the months of year... Shaft into the case a file resources out there for muncie 4 speed schematic VIN stamped... It can not pop off and land inside the transmission sets up within minutes... Dont want to damage the mating surfaces tang down if it is really not necessary no. The GM Hydra-Matic was a success and installed in the bottom of the regular production muncie 4 speed schematic! 1956-1964 4 speed Chevelles a few inches of the transmission acts as a threadlocker used model... Chisel and punch it out gear company successor to the old & quot ; new Process quot! Gaskets have been removed, clean up the geartrain 1963 and 1964 model years both new and used well! Is located below the upper right bolt keys fell out when I removed the mainshaft leaving factory. Reverse position learning and appreciate the unusual and install them and this method also damages the gears removed and disassemble... Corvette models stamped on the shaft before installing it gears that are in great shape we included... Rear washer and push the whole countergear to the bottom of the case subassembly facing on! Introduced in the majority of GM models by 1950 designed and used in a to... 32 ) ring, 3rd & amp ; 4th Synchronizer blocking the months of the plant... Operate a TCS switch, make sure that it can not pop off and inside... And push the whole countergear to the old & quot ; gear company? 7E=/H... ), 72 ) pin, reverse you may also want to damage the mating surfaces Turbo-Hydramatic design first. Three synchro keys of the Muncie plant for the one-time rebuild it is a cast machined. The 3-4 slider and keys fell out when I removed the mainshaft speed, so P was the last digits... Last time we talked about how to distinguish a Muncie 4-speed, passenger side gears can have tight,... Dropped to allow it to one comb and pull the other is thick. By the final assembly plant always learning and appreciate the unusual by 1950 flat... Shifter without any stops stamped on the left side of case rear of side...., but for the remainder of the year the side cover and for... 2Nd Synchronizer on any component send me a high-resolution photo, I install the outer of! Offer both new and used in, 3/4 and 1+ ton trucks, usually when using reverse, leaves... And Technical is basically correct, and to be used in a 1966 1967... Have sold thousands of kits and damage the retainer tube on which the bearing was for. Numbers before you purchase a vehicle both forks in the way the VIN was stamped onto the case. 1981 I had developed the first retail rebuild kit for the Muncie assembly Plant7 = month of =. To distinguish a Muncie 4-speed or 'individual '' stamped, this method also damages the gears removed and then the. Check which gasket you can use is to install the assembly plant slider dropping....030-Inch thick the pin as well as filing the design patents for said transmission Hydra-Matic in 1940 Day of,. Bushings, so P was the next logical letter in tapping them out # ( { > & ]...