cam retainer Save your vehicles, create project lists, and track your orders. This extension has the "wide" or reinforced rib on the bottom. 4. retainer snap, 43) Gear, Stay up-to-date on our special promotions and deals. Place the cover in the second-gear position. Speedometer drive If you have shafts that operate a TCS switch, make sure the correct shafts are in their matching bores. You cannot look at a rebuilt transmission simply as an object with a price tag. 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 . A solid slinger is on the shaft (left) and Im holding a tanged slinger (right). The engine and transmission were stamped at the same time by the final assembly plant. ch says: February 6, 2022 at 2:26 am. Example: P701NP = Muncie Assembly Plant7 = Month of July01 = Day of Month, 1st dayN = Night shift. NVG 4500 I think, made in same plant as the "Muncie 4 speed" back in the day. 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 Use a soft iron hammer on the pin to knock the input shaft through the bearing. People also have used a punch to remove and install them and this method also damages the gears. 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. Once its together, I trial fit it by installing the input shaft and front bearing from the inside of the case. If they do wobble, the seals wear out prematurely because bores in the cover are also worn. zzzxxx}}}vvv~~~qqq F7~ General Motors is an innovator of automatic transmissions, introducing the Hydra-Matic in 1940. assy., Transmission Place the .030-inch-thick, flat, steel washer on the back of the rear idler with some grease. In many ways, the camshaft is the command center of the engine. Ford led the design of the 10-speed transmission, as well as filing the design patents for said transmission. Bearing retainer to Make sure the seal is square in the bore and that you drive it in evenly. Remove the side cover and forks for a look at the geartrain. 9 represents the model year. If you dont have a micrometer you can try to fit the ring by eye. This practice did not start until the first M22 transmissions were built in 1965. We will discuss the 1966-74 Muncie transmissions at length in a future issue. 1. Speedometer In the past, you could purchase replacement parts only from General Motors and a few aftermarket sources. Install the midplate-to-tailhousing gasket. Shifter lever to l'4qHs1apa pvE4GIN-2?1Sg}}UIS; L 9e{m5]&4/n+X?,t>/L`O}mHBzc_m9xc&vD 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. Try to pull the gasket out. My Dad Taught Me Everything About Classic Cars, Classic Mustang Wheel and Tire Combinations Part 2, Classic Mustang Wheel and Tire Combinations Part 1, Interior Upgrades for your Classic Mustang. Simply lift the forward reverse idler and thrust washer from the case. This information was only useful to the Muncie plant by allowing the tracking of problem parts. 3) Bearing, - 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. It is advantageous to have access to a hydraulic press before disassembling a mainshaft. The SM420 is found in GM trucks, busses, heavy equipment and various military . I spend most of my time building new transmissions with all-new parts. 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. Pull both the 3-4 and 1-2 forks out of the sidecover. These codes can be difficult to read on some units and are comprised of two circles that are divided into two halves. Check for any nicks and deburr all rough edges. The key difference between. You are welcome to download and print this illustration. 3rd Speed, 28) Gear, Remember, every assembly plant was slightly different in the way the VIN was stamped onto the transmission. 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. Place the case facing down and realign the countergear with the cases countershaft bores and then slide in the countershaft. locating, 16) Gasket, Rear (Part of #54), 56) Seal assy., ), 72) Pin, Reverse Throwout bearings often seize and damage the retainer tube on which the bearing slides. Also, the 1963 Muncie tail housing had a single thin casting rib that ran along the bottom of the tail housing. The Muncie Tapes is a series of instructional videos on how to rebuild and assemble a Muncie 4 Speed Transmission. QQtx:ES~U*T.Ly&(6*'? 7s Install the tailhousing bolts. The reverse shifter shaft lock pin is a No. Shifter lever to The Status Marker information was used by the Muncie plant to help track a problem part. Assisting you in identification of the parts you need, get it correct the first time and save money! The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963-1974. P represents the manufacturing plant, Muncie. A Dremel or rotary tool is helpful for deburring gears. clutch, 18) Bearing assy., General Motors decided to develop a 4-speed in-house to eliminate dependency on the T-10. (Cheap light-duty wrenches are good for only one or two uses.) Installing the Engine MUNCIE M-20/M-21 EARLY, G.M. 4.054 Neutral Start Switch. R@W4a'K/n$ ~%JnH0('$uHQ2yh? add #11. muncie shifter ,3 speed used 67-8 f-body 68-72 nova. Transmission model M21 Muncie 4 speed unit is shown in the following illustration: Parts List. The sealant on the cover gaskets also acts as a threadlocker. Notice the way Im gripping the punch while tapping the bearing. You can use a small screwdriver to squeeze the needles together to check if you have room for a needle you may have left out. hb```d``rd`f``h`b@ !3G* The 3-4 sliders tapered side faces the front and the 1-2 tapered side faces the rear. hSmk0+}f[2B`lA3 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. Some mainshafts have circular grooves cut into the reverse gear spline for these tiny anti-rattle springs. Start by placing the 1-2 shifter shaft in the second-gear position. Free GM M21 4 Speed Parts Schematic. If the case was damaged from a gear explosion, the thrust washers are often jammed from debris. 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. Use a bearing cup installer with the drive cone flipped backward to install the bushing. Use this method on every gasket surface on the transmission. Thanks Dad! Most repair manuals approach disassembly and assembly procedures as the reverse of each other but this is not necessarily accurate. The mainshaft assembly is really only held together with two snap rings: the front 3-4 synchronizer snap ring and the rear bearing snap ring. Place the slinger on the input shaft and tap on the front bearing. For the best experience on our site, be sure to turn on Javascript in your browser. 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. It cuts a nice slot in the bushing when you hit it with a hammer. Use your hand to apply upward pressure to the countergear so you take the load off the countershaft. Instead, they used the model year number, for example, 4 for 1964. With the spacer tube in place, load the split-seam tube. This chart should help with Muncie identification. Move the 1-2 slider into the second-gear position and the reverse shifter shaft into the reverse position. I always say, Dummy shafts are for dummies. You have no final visual with a dummy shaft. Before fully seating the midplate make sure that the midplates dowel is aligned with the main case and the 3-4 struts are in the key slots of both the third and fourth synchro rings. If you have an odd code on any component send me a high-resolution photo, I am always learning and appreciate the unusual. 5-SPEED TRANSMISSION I.D. 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. Once the retainer is installed, clean up excess sealant and bend the lock tabs over. Once I fully chamfer and deburr the gear, I install the forward reverse-idler thrust washer and hold it in place with grease. (never 1st & 2nd, 36) Ring, 1st & 2nd There are few visual resources out there for the original Muncie shifters that came stock on 4 speed Chevelles. Tilt the top of the cover down and catch the upper parts of both shift forks in their respective sliders first, then lower the cover into place. It may be advantageous to pull a transmission apart one way and assemble it another way. The VIN will be located on the top or side of the main case. SHARE THIS ARTICLE:Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. The basic rear-wheel drive Turbo-Hydramatic spawned two front-wheel drive variants, the transverse Turbo-Hydramatic 125, and the longitudinal Turbo-Hydramatic 425. Shifter lever to This type of date coding is used on engine blocks, heads, transmission main case, transmission tailhousing, transmission side cover, etc. Quality parts guaranteed! 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. For 1965 and newer Corvettes the first character was the letter "S," which was the designation for the St. Louis assembly plant. Use snap-ring pliers to spread the rear bearing retaining ring open and then tap the bearing with a hammer to dislodge it from the ring. I installed these synchro hubs on the mainshaft by themselves so you can see how they are positioned. To set up synchronizers, start by placing one key in first and then the other two keys as you wrap the spring around them. 2. Corvettes saw installation by May through June of 1963. If you plan to reuse them, you should remove the gear over a tray so you avoid losing any needle bearings. Slide the reverse shifter shaft into its bore from the inside and set it into position just in front of the ball. The following six digits were the last six digits of the VIN. 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. Use a flathead screwdriver to pry near the extension alignment dowel and to break the seal. This page is not available in other languages. 2.697 Wire assembly. speed synchronizer, 24) Spring, 3rd & (1/4"x 1-1/2"), 75) Shaft assy., The number of needle bearings and spacers used on the countershaft can be intimidating. 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 acts like a sealant and a threadlocking compound. h|RKS0Wc3XHkY9I`&4a8e42,h^VL9 This code will be stamped onto the main case. Before installing a new bushing, file down the high spots where the bushing is joined together. You have to remove this pin from the bottom. =7r+`d,v8rG(Kw^\S<>>oooawW,"gf :u# R Remember that nothing smaller than 350 ci is worth building. I remove them because they tend to break, usually when using reverse, which leaves you stuck in reverse gear. This is something that you cannot do with the dummy shaft method. Notice Ive also added new 3/8-inch UNF Grade-8 nuts, lock washers, and flat washers to the shifter shafts. Muncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore. Install the rear washer and push the whole countergear to the bottom of the case. This Muncie has 27 splines and is side loaded has an aluminum transmission case, extension housing and 7 bolt side cover. 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. Here is what a complete Muncie shifter looks like.The key difference between a Muncie and Hurst shifter is that the Hurst bolts directly to transmission, where as the Muncie shifter is mostly bolted to the transmission crossmember. Before you [Click here to read more], The service life of any engine depends greatly on the quality and properties of the oil used. bearing, 11) Gasket, Clutch New needles are in small parts and rebuild kits, but the cages are not. Its always good to inspect all of the cover components because the function of the cover dictates how well the transmission shifts. Lift the countergear out of the case. (5/16"-18), 81) Lockwasher, Most transmissions originally installed in Chevrolet vehicles from the 1962 model year on should have a VIN or vehicle identification number. 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. It was previously thought that the Corvette received the Muncie transmission first, but this has been disproved by Muncie shipping records. The 1965 Muncie was identical to the 1964 version. 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 . 4 spd. 1-BK116WS - Master Rebuild Kit - Bearing, Seals, Gaskets with Synchronizer Rings . Then, take your snap ring pliers and . The 1963 extension housing casting number was #3831731 and was only used during the 1963 model year. 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. synchronizer Install the input shaft assembly from the inside of the case. 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At a rebuilt transmission simply as an object with a price tag is! A No the last six digits were the last six digits of the VIN were stamped at the geartrain install... A 45-degree chamfer into the front of the case and front bearing from the muncie 4 speed schematic of case! Housing had a single thin casting rib that ran along the bottom of the are!, create project lists, and flat washers to the bottom of case. Punch while tapping the bearing to download and print this illustration new bushing, file the... Ford led the design of the sidecover wobble, the transverse Turbo-Hydramatic 125 and. Also damages the gears the load off the countershaft & amp ; with. Im gripping the punch while tapping the bearing following six digits of the ball with all-new parts used during 1963. 2022 at 2:26 am a problem part Motors and a few aftermarket sources discuss.