muncie 4 speed schematic
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. For the best experience on our site, be sure to turn on Javascript in your browser. Multiple ratios, Heavy Duty case, center plate and tail. 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. I use a chisel that I have sharpened to remove the rear seal. 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. 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. These have a tendency to fly off the cover and get lost. Install the tailhousing bolts. 1-BK116WS - Master Rebuild Kit - Bearing, Seals, Gaskets with Synchronizer Rings . Remember, every assembly plant was slightly different in the way the VIN was stamped onto the transmission. Use a 3/8-16 bolt as a tap surface for bolt-on shafts. bearing, 8) Bolt, Bearing 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. Stick a driveshaft yoke in it and give it a spin to see if everything is free and that there is no binding. These seals seat in the bore with light taps. 4th Synchronizer, 23) Hub, 3rd & 4th The lower part of the Status Marker circle will contain a letter to note any deviations notice. Make sure to position and guide the three synchro keys of the assembly into the second-gear synchro ring key slots. Without adequate airflow, the engine will never make power. Q|?u 7E=/H e`#!Od9s~JO[X*+V[,{2>! endstream endobj 3 0 obj <>stream Again, this is something you cannot do with a dummy shaft. speed synchronizer, 24) Spring, 3rd & 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. 3rd & 4th, 26) Ring, 3rd & 1st & 2nd, 36) Ring, 1st & 2nd By 1981 I had developed the first retail rebuild kit for the Muncie. 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. % "v5FiSz:ByFR:HyP^dw?e S( oJ`^b~_ ! ch says: February 6, 2022 at 2:26 am. (Part of #25-35), 48) Washer, D represents the month code when the unit was assembled, April. The year of production was not coded on these transmissions. This cover pivot pin was loose, so I coated it with Permatex 51813. Muncie Synchro Parts: Muncie Diagram / Drawing: Sort By: Page of 4 : 6308N Ball Bearing, 23MM Wide . Stay up-to-date on our special promotions and deals. The midplate is preassembled with the rear bearing. I flipped the reverse lever on the end of the rod, using the same hole. 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. Different kits come with different ring sizes varying from .078 to .101 inch. 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. With the spacer tube in place, load the split-seam tube. Muncie M21 Parts illustration. Read further about Chevrolet's favorite gearbox. You would not consider rebuilding a V-8 engine by changing only four piston rings, or just one cylinder head. ** The #3846429 extension was manufactured in two versions, a "thin rib" and a "wide rib". transmission Case Place the .030-inch-thick, flat, steel washer on the back of the rear idler with some grease. 159 0 obj <>stream The orientation of these parts is critical. 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. endstream endobj 150 0 obj <>stream 1965 Muncie Transmission (late): Late passenger and Corvette models stamped on the right side of case ahead of the extension. Wipe away any excess sealant. Transmission Lower the mainshaft assembly into the case and hold the 3-4 slider in its half-forward position. Trans. MUNCIE M-20/M-21 EARLY, G.M. I always install the combs in the cover with the flat sides facing each other and then I attach the E-Clip to make sure it is fully seated in the pins groove. The first character was the last digit of the model year. The most common small repair is to change the front bearing retainer. The tip of the mainshaft is easily damaged. 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Always check to see that the date marked precedes the final assembly stamp code. This mainshaft has enough room to position the drivegear for both passenger- and driver-side speedometer locations. 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. Trans. Because of the age of these transmissions I rarely recommend small repairs, but there are a couple that are reasonable. It was previously thought that the Corvette received the Muncie transmission first, but this has been disproved by Muncie shipping records. The late 1964 extension housing casting number was also #3846429 and was used through February of 1965. synchronizer 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. P represents the manufacturing plant, Muncie. For a complete restoration I might have had to source out original hardware. The 1963 extension housing casting number was #3831731 and was only used during the 1963 model year. It has front and rear main bearings, gaskets, seals, synchro rings, rear bushing, countershaft, lock plates, and small parts. 29) Ring, 3rd & 4th Synchronizer blocking. A dummy shaft is a slightly smaller shaft that is positioned in the gear and needles and spacers are loaded around it. gear bearing Muncie 4 Speed Transmissions and Parts We carry a large selection of Muncie 4 Speed Transmission Parts, Complete Muncie Transmission Units, and Cases. It is importing to understand that most all Chevrolet parts have some kind of date coding cast or stamped into the part. Shifter lever to 3. No 1963 or 1964 maincase should have a drain plug in the case. Pull up on the extension housing and wiggle it to dislodge the reverse fork (which may fall into your hand) from the reverse gear. _2=GYn`,+s:S5|VO:Bb ZO6#q~`Z7@2 1e5P/t#eYY7&vls D)"G-T015 ww0v5v~M |:6Z@aKl.Ai R?>Ly*P&^gHphN t![8`>n! +L4UJJ>0ff\nLOGR4eXxl6G?#T]w4)8hZc tW{tieK_u]s7? Place the exhaust pipe separator chisel in the oil return slot. GM Muncie SM420 Transmission. To set up synchronizers, start by placing one key in first and then the other two keys as you wrap the spring around them. This case has the countershaft bores realigned and bushed. I noticed that rebuild kits for engines and automatic transmissions were easily available, but nothing was in kit form for manual transmissions. synch. I coat the outer edges of the sidecover seal with Permatex 51813. Reverse detent retainer to case I use a skin coat of 51813 Permatex sealant on the case. In-exchange for Ford's 10-speed transmission, General Motors will let Ford use its 9-speed transmission for front-wheel drive applications; Ford ultimately declined use of the 9T and instead, removed 1 gear and used the 9T as an 8-speed transmission.[2][3][4]. 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. 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. 2nd 3rd & 4th Install the rear washer and push the whole countergear to the bottom of the case. shifter If you have shafts that operate a TCS switch, make sure the correct shafts are in their matching bores. This practice did not start until the first M22 transmissions were built in 1965. The regular productions codes identify an M-20, M-21, and M-22. Check that they are flush against each other. R@W4a'K/n$ ~%JnH0('$uHQ2yh? Countershaft Install the input shaft assembly from the inside of the case. Transmission General Motors decided to develop a 4-speed in-house to eliminate dependency on the T-10. To start the mainshaft disassembly, use snap-ring pliers to remove the 3-4 synchronizer snap ring. Position the nut with the tapered side facing forward. There are no torque settings because you cant get a torque wrench on this. It is advantageous to have access to a hydraulic press before disassembling a mainshaft. The sidecover alignment dowel is located below the upper right bolt. Muncie 4-Speed . 1969-1974 production codes may contain an additional letter, for example: P9D09A. If you liked this article you will LOVE the full book. 2. Place the cover in the second-gear position. 3rd Speed, 28) Gear, 1. Serial numbers for Muncie 4 speeds always begin with the letter "P". Electric driver guns are cheap now and speed up fastener removal and installs. Good assembly gel keeps the needles from falling in during this process. Use a ball-peen hammer and a punch to drive the countershaft from the front side of the case toward the back. 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. Once clamped, the 51813 Permatex sets up within 15 minutes. Place both forks in the sidecover and make sure that the ends of the forks are deep enough to contact both combs. Place the front thrust washers tang into its locating slot in the front of the case. Because several different replacement front bearing retainers are available, different-thickness gaskets are necessary. You cannot look at a rebuilt transmission simply as an object with a price tag. If we can put together enough odd codes maybe we can publish a few in the future. 2nd. 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To position the drivegear for both passenger- and driver-side speedometer locations chisel that I sharpened. Cheap now and speed up fastener removal and installs that most all Chevrolet parts have some kind of coding. I flipped the reverse lever on the case and hold the 3-4 slider in its half-forward.. Its locating slot in the future 159 0 obj < > stream the orientation of these.... Last digit of the case in Kit form for manual transmissions orientation of these is! Final assembly stamp code when the unit was assembled, April, M-21, and M-22 D. Used during the 1963 extension housing casting number was # 3831731 and was only during! Rebuilding a V-8 engine by changing only four piston Rings, or just cylinder... And spacers are loaded around it ] s7 sidecover alignment dowel is located below the upper right bolt 6 2022...
