Notice the new fill and drain plugs on the main case. In this video, I show you how I installed the Muncie M21 4-Speed behind an LS Engine in my 1964 Chevy Impala using the factory Z-Bar and mechanical clutch li. lever to shaft It cuts a nice slot in the bushing when you hit it with a hammer. 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. This application uses a wide rib. I remove them because they tend to break, usually when using reverse, which leaves you stuck in reverse gear. 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. Never use a dummy shaft to load needles. Most front nuts are seized onto the shaft. At first I had alignment issues with the reverse lever and rod. Another common repair is a rear seal change. The countergear is still dropped to allow it to be placed in this position. Second gear is supporting the geartrain during this mainshaft press procedure. 11/16"), 80) Nut, Shifter 3. 146 0 obj <> endobj I coat the outer edges of the sidecover seal with Permatex 51813. used), 33) Spring, 1st & CHART *MUNCIE Shaft Identification: Muncie 4-speed transmissions can be distinguishedvfthe rom style of the transmission arm attachment. I flipped the reverse lever on the end of the rod, using the same hole. You need to be in second gear to clear the reverse idler case boss. 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. 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 was made by General Motors from 1968 to 1991. blocking, 27) Gear, A transmission that leaks after a rebuild can be a huge disappointment. Transmission Speed synchronizer, 32) Ring, 1st & 2nd muncie 4 speed shifter & linkage, 67-68 camaro 68-72 nova 67 fb. sleeve, 61) Fork, If the 3-4 slider is still on the shaft, (refer to drawing) remove it by pulling it off by hand. I use the case to support the cover when I press in the sidecover seals with a 17-mm socket. Aisin AY6 6-speed longitudinal manual made by Aisin. It can be acceptable for the Status Marker circle to be blank. =7r+`d,v8rG(Kw^\S<>>oooawW,"gf :u# R In the last decade, significant strides have been made in the ability of high tech oils to combat wear. The object is to get the thickest ring in the rear mainshaft snap-ring groove. Muncie casting date codes are very different from other transmission manufacturers. The SM420 was made by General Motors from 1947 to 1967. l'4qHs1apa pvE4GIN-2?1Sg}}UIS; L 9e{m5]&4/n+X?,t>/L`O}mHBzc_m9xc&vD Place a new locating snap ring in the midplate, spread it open, and start the rear bearing in the bore. This means that you are completely disassembling the gearbox, inspecting all parts and components, replacing worn and damaged parts, installing suitable gaskets and bearings, and then assembling all the components into a complete unit. These seals seat in the bore with light taps. It remains tacky even when the air temperature is high. You can copy and paste this link to share: https://www.chevydiy.com/how-to-rebuild-your-muncie-4-speed-a-complete-guide/. This number is much different than the casting date codes for the individual parts that make up the transmission, which is covered below in the Casting Date Code section. Shifter lever to It helps make your rebuild look more professional. %PDF-1.6 % The extension housing has three 9/16-inch-head 3/8-16 bolts on the upper half and three 5/8-inch-head 7/16- 14 bolts on the bottom. If you are going to change a 45-year-old front bearing it is in your best interest to change all the bearings. 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 . NOTE: We have included the 1966-74 Muncie identification above for reference usage only. Main shaft front, 19) Ring, 3rd & 4th Position the 1-2 slider forward in second gear, and shift the sidecover 1-2 fork into second. The synchro hubs are positioned so that the forward edge of each hub faces the front. Dont force it; gently work it loose. 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. Some people never disassemble the sidecover when doing a rebuild. 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. Combs have a rounded side and a flat side. The month is determined by numbers 1 through 12, which correlate with the months of the year. 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. '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 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. The extension housing code is usually within a few inches of the casting number, also on the passenger side. shaft (5/16"), 82) Lever, 1st & All Muncie 4-speed transmissions were stamped at the Muncie assembly plant with a production code number, consisting of a prefix letter, production date and shift suffix letter where day and night shifts were in operation. Make sure all gears spin freely on the mainshaft and put the whole assembly aside. R@W4a'K/n$ ~%JnH0('$uHQ2yh? Remember, every assembly plant was slightly different in the way the VIN was stamped onto the transmission. This extension has the "wide" or reinforced rib on the bottom. 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. The only special tool you need is a Muncie front-nut wrench (the red one here). blocking, 37) Gear, Use your hand to apply upward pressure to the countergear so you take the load off the countershaft. I drive it straight down the shaft until its seated. Do that in a non-restrictive manner, and you have a good intake manifold. If the case was damaged from a gear explosion, the thrust washers are often jammed from debris. h|RKS0Wc3XHkY9I`&4a8e42,h^VL9 Always reinstall the spring facing in this direction. There are few visual resources out there for the original Muncie shifters that came stock on 4 speed Chevelles. All rebuilt manual transmissions are dyno tested before leaving the factory and have a 12 month no hassle warranty. There is another way to quickly identify Muncie transmissions. (7/16"- 14x1-7/8"), 58) Gear, * The #3846429 extension was manufactured in two versions, a "thin rib" and a "wide rib". transmission countershaft, 4) Washer, C-ear thrust, 53) Gasket, Rear At this point, the geartrain is completely apart. 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. If the transmission goes together with the sliders installed incorrectly, the worst thing that happens is that when you go to fit the sidecover on (the last step), nothing fits. Muncie manual trans. 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. Last time we talked about how to distinguish a Muncie four-speed transmission. Slide the 3-4 synchro assembly into place by locating the three keys into the third-gear synchro rings key slots. 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 bearing retainer Pry near the dowel to remove the cover. gear bearing Torque the three upper 9/16-inch head and three lower 5/8-inch head bolts to 25 ft-lbs. 1. 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. There were two maincase casting numbers used for the 1963 and 1964 model years. (Part of #54), 56) Seal assy., l)3:9(kW7x M,]Ff2 Pre '69 Muncie's use a stud & nut at the indicated attachement point, while '69 and later Muncie's use a bolt as 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. Here, Im using a block of wood. The SM420 is found in GM trucks, busses, heavy equipment and various military . For the best experience on our site, be sure to turn on Javascript in your browser. Click the button below and we will send you an exclusive deal on this book. The stamping method used could be "gang" or 'individual" stamped, this method varied and was chosen by the assembly plant. On some main cases, such as the late model Saginaws, there is a cast and machined pad provided for the VIN. The Status Marker information was used by the Muncie plant to help track a problem part. Flip the assembly over and (starting from the same key) position the spring exactly as before. Use an arbor press to remove the front bearing. This one is really tight and will have to be pressed off. This type of date coding is used on engine blocks, heads, transmission main case, transmission tailhousing, transmission side cover, etc. Extension housing castings are prone to cracks around the reverse shifter shaft boss. Simply attach it to one comb and pull the other end into the opposite comb with the pliers. shaft First and second gear, the 1-2 synchro assembly, first-gear sleeve, reverse gear, speedometer gear, and the rear bearing midplate slide off the shaft together. By doing it this way, you use the reverse gear to press the speedo gear off and avoid any damage to the gear. hbbd``b`@ H0_A ' - rear, 51) Washer, It is clear, though that when fully bolted down/supported and with correct linkages there is no clearance issue.The linkages shown are Dynacorn remakes of 1970 rods and transmission mounted levers. 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 Muncies are rarely tight enough to need a press. It is advantageous to have access to a hydraulic press before disassembling a mainshaft. 2. Different kits come with different ring sizes varying from .078 to .101 inch. You must be observant and methodical as you go through the disassembly of a Muncie 4-speed. Huge variations exist in the quality of replacement parts and the skills of rebuilders. 4.054 Neutral Start Switch. Use a 1/2-inch socket and torque the 7 sidecover bolts to 18 ft-lbs. The following vehicles are likely sources of a Muncie four-speed. You would not consider rebuilding a V-8 engine by changing only four piston rings, or just one cylinder head. You cannot look at a rebuilt transmission simply as an object with a price tag. Lower the countergear from the back, placing the front of the gear on top of the front thrust washer. For the best experience on our site, be sure to turn on Javascript in your browser. Fred says: November 1, 2020 at 12:31 am "NVG" stands for "New Venture Gear". assy., Transmission, 55) Bushing, OE Replacements. One half of the Date Marker circle will have a month designator for when the part was cast. In this diagram from the service manual, heavy bearing grease is used to retain 17 new roller bearings and a retaining cage into the main drive gear cavity before installing the unit . It is basically correct, and to be used in a 1966 to 1967 Muncie M20 application. 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. Because several different replacement front bearing retainers are available, different-thickness gaskets are necessary. I use a 20-pound spring. 2nd 3rd & 4th People also have used a punch to remove and install them and this method also damages the gears. Combs can bend from aggressive shifting or from using a shifter without any stops. buy 4 - 4 and get 15% off buy 5 or above and get 20% off . Place the case facing down and realign the countergear with the cases countershaft bores and then slide in the countershaft. Later Muncies with hardened hubs require this assembly to be done in a press. Many other assembly plants stamped only the sequential number, with no prefix.Please remember that GM plants such as BOP (Buick-Oldsmobile-Pontiac) building other car lines were also stamping VINs using their own guidelines, so you will probably see a variety of styles. Complete Manual Transmissions. I use a special heavy-duty wrench for this. Synchronizer, 35) Synchronizer gear bearing This is not model or year specific. ch says: February 6, 2022 at 2:26 am. 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. case (5/16"int. 1. 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. 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. Install first gear with a little oil in its bore. 2nd. It has front and rear main bearings, gaskets, seals, synchro rings, rear bushing, countershaft, lock plates, and small parts. All of GM's early automatic transmissions were replaced by variants of the Turbo-Hydramatic by the 1970s. gear bearing Some early 1969 transmissions did not have this additional letter. It can never be taken for granted that the installation of new parts guarantees a fully functional and problem-free unit. Last edited on 22 December 2022, at 04:17, "Hydra-Matic History: The First Automatic Transmission", "Exclusive: An Inside Look At Ford's New 10 Speed Transmission", "Ford and GM finally consummate 9- and 10-speed joint development", "Ford passes on GM's 9-speed automatic transmission", "GM Hydra-Matic 9T50 Transmission Confirmed for Chevrolet Cruze, Malibu, Equinox", https://en.wikipedia.org/w/index.php?title=List_of_GM_transmissions&oldid=1128819580. It may be advantageous to pull a transmission apart one way and assemble it another way. By 1981 I had developed the first retail rebuild kit for the Muncie. Your #1 Source of Restoration and Restomod Parts! 2nd Synchronizer, 34) Sleeve, 1st. shaft, 64) Lockwasher, The first thing we are going to cover in this installment is transmission Build Date Codes. (1/4"x 1-1/2"), 75) Shaft assy., The Turbo-Hydramatic was used by all GM divisions, and formed the basis for the company's modern Hydramatic line. Install the rear bearing. The number of characters in the VIN stamp varied from plant to plant. Im using the same driver set that I used for the bushing, just a different size. 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. Switches and Wiring. the car's sequential assembly number. I use a micrometer because some rings only vary in thickness by .005 inch. It replaced the T10 in General Motors' cars, starting in February of 1963. 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. The steel gears are soft and pullers easily damage them. Occasionally I have to cut out a stubborn snap ring using a small rotary cut-off wheel such as a Dremel Moto-Tool. That is both good and [Click here to read more], An intake manifold is about as simple as it gets, right? detent (3/8" Dia. Free GM M21 4 Speed Parts Schematic. Transmission 1st & One circle is the Date Marker and the other circle is referred to as the Status Marker. (5/i6"- 18 x 3"), 9) Lockwasher, cF There are no torque settings because you cant get a torque wrench on this. ball, 71) Ball, Reverse A dummy shaft is a slightly smaller shaft that is positioned in the gear and needles and spacers are loaded around it. If it is a used part, make sure that the idler has no up-and-down play on the shaft. 4th Synchronizer, 25) Synchronizer synchronizer If you have to pull it apart again, it is one less step to perform. part #342861 $239.00. Muncie M21 Parts illustration. 1963 & 1964 Muncie Transmission: Passenger and Corvette models stamped on the left side of case rear of side cover. This Muncie has 27 splines and is side loaded has an aluminum transmission case, extension housing and 7 bolt side cover. Instead, they used the model year number, for example, 4 for 1964. xu=|un/f)Tzj f5]6%&x7RucO,Mm!W#GSMtnT{zLXTTGq))- Others require a press. The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963-1974. Many Muncie 4-speed main cases, extension housings, and side covers have a casting date code. Remember that nothing smaller than 350 ci is worth building. The easiest way to check which gasket you can use is to install the thin one first. Reverse detent If you have shafts that operate a TCS switch, make sure the correct shafts are in their matching bores. The date marker has a month designator for when the part was cast or manufactured. Read further about Chevrolet's favorite gearbox. retainer, 12) Nut, Clutch Push the retainer onto the bearing and try to pinch the gasket between it and the case. Use a bearing cup installer with the drive cone flipped backward to install the bushing. 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. Once engaged in the input, push the 3-4 slider back into its neutral position. SHARE THIS ARTICLE:Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. 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. For some reason when it comes to rebuilding a manual transmission the concept of a complete rebuild seems to get lost. Some later input shafts no longer have this hole; using red threadlocker is a must. ret. From the left, the subassemblies are the tail section, main case, sidecover, and mainshaft with midplate. synch. Reverse idler rear 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. For 1965 and newer Corvettes the first character was the letter "S," which was the designation for the St. Louis assembly plant. The circular springs keep tension on the gear to prevent rattles. Through the 1950s, all makers were working on their own automatic transmission, with four more developed inside GM alone. 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. 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. 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. 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. Stud-type shifter shafts should have a nut put on them to aid in tapping them out. Most of the Build Date Codes will precede the build date of the car by approximately two weeks to 90 days. Bearing retainer to This image shows the correct relationship between needle bearings, their spacers, and the center tube. PRE 69' MUNCIE & ALL BORG-WARNER SHAFTS 4th synchronizer, 21) Ring, 3rd & 4th Posted in Corvette, C1 1953-62, Technical, C2 1963-67, Technical, C3 1968-82 and Technical. Muncie 4-Speed . Reverse shifter I have two classifications of parts for Muncies: hard and soft. The Muncie transmission was an aluminum main case/extension housing, side-loaded transmission with a side-lever shift linkage. If the pin is really loose, replace the cover. You can use a bearing clamp to support the bearing and an old wrist pin over the front pilot to protect it. Let me explain. Never use silicone sealant because it takes days to dry. You can pull the shaft out of the back of the case, and then safely store it. Use a pry bar, ice pick, or flathead screwdriver to snag the shifter shaft seals and remove them from the bore of the cover. Make sure the seal is square in the bore and that you drive it in evenly. You can use a chisel to easily remove them. . What could [Click here to read more], Congratulations! However, many people misunderstand what really constitutes a complete rebuild. Put a little sealant on the top of the pin as well as on the bottom of the pinhole. Start by placing the 1-2 shifter shaft in the second-gear position. 0 tapered pin that is wider at the top than at the bottom. In many ways, the camshaft is the command center of the engine. Use a ball-peen hammer and a punch to drive the countershaft from the front side of the case toward the back. The following six digits were the last six digits of the VIN. This page is not available in other languages. I was the first to get my kits into most of the specialty muscle car retailer catalogs. This was done to aid in identifying the transmission ratios. shifter shaft, 86) Ring, Detent I usually stack second gear, first gear, and the 1-2 synchro assembly together and stack third gear and the 3-4 synchro assembly together. Use a small screwdriver to snag and drag the C-clip off the 5/16-inch-diameter detent cam. The early #3846429 extension has the casting numbers cast directly into the part. 04 represents the month code when the unit was assembled, April. Position the nut with the tapered side facing forward. add #10. muncie 4 speed shifter, no mount, no linkage, repro. One circle is called the date marker, the other the status marker. Muncie Dissassembly Step 1: Remove Sidecover Bolts Start by placing the 1-2 shifter shaft in the second-gear position. MUNCIE M-20/M-21 EARLY, G.M. Some mainshafts have circular grooves cut into the reverse gear spline for these tiny anti-rattle springs. Reply. Obviously, those are easily removed. The basic rear-wheel drive Turbo-Hydramatic spawned two front-wheel drive variants, the transverse Turbo-Hydramatic 125, and the longitudinal Turbo-Hydramatic 425. We also carry and sell Complete Do It yourself Super Muncie Kits. Use pliers or a spring hook to install the spring. 1st & 2nd, 36) Ring, 1st & 2nd Use snap-ring pliers to remove the outer snap ring from the front bearing. Transmission Sometimes you can pry on this and remove the bearing. Step 2: Remove Sidecover The sidecover alignment dowel is located below the upper right bolt. 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. Make sure to position and guide the three synchro keys of the assembly into the second-gear synchro ring key slots. 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. 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. We provide parts in three separate categories for the Muncie M20 4 Speed: Overhaul kits by application include standard kits, heavy duty kits for more horsepower and "WS" kits that include both bearings and syncro rings as well as gaskets and seal s. IDENTIFICATION - CHEVROLET 4spd, RWD, M20, Muncie, aluminum case, 7 bolt side cover They have no moving parts and merely have to connect the carburetor or throttle body with the intake ports. Locate the first-gear synchro rings three key slots on the 1-2 synchro assemblys keys. Main shaft rear, 42) Ring, Main Invest in the proper thread repair kits and seek out quality weld repair work if it becomes necessary. If they are really bad you should change them out. reverse, 45) Plate, Make sure it clears the front thrust washer and seats in the front bore. 1965-72 4 spd. This code will be stamped onto the main case. illustrated parts break down illustrates individual part placement in the assembly. 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. Install the second-speed gear with the synchro ring and the 1-2 synchro assembly.
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