Military specification versions were made through the early 1980s. The next step is to drop in the reverse idler. Focus on getting all the gears removed and then disassemble the sidecover and extension housing. Install the midplate-to-tailhousing gasket. If you had to press the hubs off, you most likely have to press them back on. Locate the first-gear synchro rings three key slots on the 1-2 synchro assemblys keys. part #342842 $150.00. blocking, 22) Spring, 3rd & Use snap-ring pliers to remove the outer snap ring from the front bearing. The object is to get the thickest ring in the rear mainshaft snap-ring groove. 2.698 Backup Light Switch. Instead, they used the model year number, for example, 4 for 1964. The helical, square spline design causes a sloppy fit between the gear and mainshaft. add #10. muncie 4 speed shifter, no mount, no linkage, repro. If the case was damaged from a gear explosion, the thrust washers are often jammed from debris. You can grind down the tang down if it does. Use this method on every gasket surface on the transmission. I have two classifications of parts for Muncies: hard and soft. This is something that you cannot do with the dummy shaft method. 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. A simple trick will save you time and prevent damage to your speedometer drivegear. Muncie M20 4-speed longitudinal wide ratio manual transmission made by GM at their Muncie, Indiana factory. Put your other hand over the C-clip to catch it once it clears the cam. shaft, 64) Lockwasher, Many Muncie 4-speed main cases, extension housings, and side covers have a casting date code. Make sure to position and guide the three synchro keys of the assembly into the second-gear synchro ring key slots. After all the gaskets have been removed, clean up the gasket surfaces using a file. fits all muncie m20, m21, & m22 models; includes gaskets, & seals; also includes smaller bearing retainer gasket for some very early units with smaller retainer; Use a ball-peen hammer and a punch to drive the countershaft from the front side of the case toward the back. 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. If the gear and hub do not come off, do not use a hammer to try to remove them. 2. Removal of the front bearing cover is where disassembly begins. This acts like a sealant and a threadlocking compound. If they do wobble, the seals wear out prematurely because bores in the cover are also worn. However, the Corvette assembly plant in St. Louis from 1962-1964 was relatively consistent. General Motors is an innovator of automatic transmissions, introducing the Hydra-Matic in 1940. Loading all needle bearings is the job everyone hates because its tedious work. driven gear, 60) Retainer, This was done to aid in identifying the transmission ratios. 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. Early units had a 1/2-inch head. sleeve, 61) Fork, The 1963 maincase casting number was #3831704. The combs must be flat. It is the successor to the old "New Process" gear company. Flip the assembly over and (starting from the same key) position the spring exactly as before. 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. Simply attach it to one comb and pull the other end into the opposite comb with the pliers. General Motors decided to develop a 4-speed in-house to eliminate dependency on the T-10. The Muncie four-speed, like the T-10, is a side-loading transmission. shifter shaft, 86) Ring, Detent These have a tendency to fly off the cover and get lost. 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. Speed synchronizer, 32) Ring, 1st & 2nd One half of the Date Marker circle will have a month designator for when the part was cast. You can use a pipe wrench if you are careful. Be careful because you dont want to damage the mating surfaces. Notice the positions of the cams and the spring. 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. Remove both shift levers and mark them so they can be replaced in the same bores. The steel gears are soft and pullers easily damage them. 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. All Muncie transmissions have a ring groove on the input shaft and counter gear. 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. I use an assembly lube specifically for transmissions. Place the .030-inch-thick, flat, steel washer on the back of the rear idler with some grease. Remember, all of these casting codes should precede the final production code of the transmission. A Dremel or rotary tool is helpful for deburring gears. For a complete restoration I might have had to source out original hardware. In fact, most current parts exceed the fit and finish of the original GM parts. (5/16"-18), 81) Lockwasher, Main shaft front, 19) Ring, 3rd & 4th lever to shaft locating, 16) Gasket, Rear If you plan to reuse them, you should remove the gear over a tray so you avoid losing any needle bearings. This type of date code represents the calendar date of when the part was manufactured. 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Never use a dummy shaft to load needles. The letter M was used to ID the Muncie plant for the Muncie 3 speed, so P was the next logical letter. Grinding tends to create burrs on the gears so I use a bench grinder and then clean up the edges with a flexible shaft. I use the case to support the cover when I press in the sidecover seals with a 17-mm socket. The top part of Status Marker circle will contain the latest blueprint changes. hT1O0ol\|:#10P,t45 u"@o]Ive"3-BCU_DWJMU^%{_B$F#UBK+%X.:5ss:azvc88,5n(.K}' _)qYeb-UP7 I Before you can start rebuilding or repairing a Muncie, or any other 4-speed for that matter, some generic tips and techniques need to be understood and practiced. The main case date code is usually found on the passenger side of the case just below the casting number. All of GM's early automatic transmissions were replaced by variants of the Turbo-Hydramatic by the 1970s. Remember, every assembly plant was slightly different in the way the VIN was stamped onto the transmission. It is importing to understand that most all Chevrolet parts have some kind of date coding cast or stamped into the part. Notice the new fill and drain plugs on the main case. 2.697 Wire assembly. If so, remove it from the extension. Simply hold the front needles in with your left hand and push the shaft through with your right. Having all these subassemblies ready to go on the mainshaft helps to keep you organized. 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 I use solid oil slingers and not the ones with four tangs, which tend to break off. 0 tapered pin that is wider at the top than at the bottom. ret. Here is what a complete Muncie shifter looks like. 1956-1964 4 speed Controlled coupling HydraMatic, also known as Cadillac 315 or P 315 HydraMatic, Oldsmobile Jetaway, Pontiac Super HydraMatic. bearing retainer P represents the manufacturing plant, Muncie. One circle is the Date Marker and the other circle is referred to as the Status Marker. Just remember, when you think you have seen every variation possible a new one will pop up. Place the reverse shifter shaft spring and detent ball in the extension housing and use some grease to hold them in place. The most common small repair is to change the front bearing retainer. The code consists of two circles, both 1/2-inch in diameter and divided in half. blocking, 27) Gear, This extension has a "thin rib" on the bottom side of the extension and is basically identical to the early 1964 #3846429 extension. %PDF-1.6 % New needles are in small parts and rebuild kits, but the cages are not. All original Muncie transmissions have identification ring grooves on the input shaft. Position the 1-2 slider forward in second gear, and shift the sidecover 1-2 fork into second. Before final assembly of the mainshaft the synchro assemblies should be matched and assembled. Trans. Once the retainer is installed, clean up excess sealant and bend the lock tabs over. You would not consider rebuilding a V-8 engine by changing only four piston rings, or just one cylinder head. Some sliders are very loose and can drop off the hub. Use a 1/2-inch socket and torque the 7 sidecover bolts to 18 ft-lbs. Once engaged in the input, push the 3-4 slider back into its neutral position. The early #3846429 extension has the casting numbers cast directly into the part. the car's sequential assembly number. bearing, 6) Spacer, Transmission 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. Dont force it; gently work it loose. Shifter lever to Hb```"%"A1e W)1m[+*$0M!Q Pkn$SIVbv%y\ex-Df5scm[6a]BL^A^ Td(()QR d`.W }d8 YST9{6LZ> PVW endstream endobj 70 0 obj 225 endobj 53 0 obj << /Type /Page /Parent 48 0 R /Resources 54 0 R /Contents 59 0 R /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 54 0 obj << /ProcSet [ /PDF /Text ] /Font << /F3 56 0 R /F4 61 0 R /F5 63 0 R >> /ExtGState << /GS1 67 0 R >> /ColorSpace << /Cs5 57 0 R /Cs9 58 0 R >> >> endobj 55 0 obj << /Type /FontDescriptor /Ascent 807 /CapHeight 754 /Descent -249 /Flags 262176 /FontBBox [ -140 -261 1195 990 ] /FontName /CCKOCC+Futura-CondensedBold /ItalicAngle 0 /StemV 141 /XHeight 505 /CharSet (/C/three/R/F/D/comma/four/quotedblleft/E/S/G/hyphen/ampersand/quotedblri\ ght/K/U/I/A/six/space/V/seven/parenleft/L/H/M/parenright/one/nine/P/N/O/\ B/T/colon) /FontFile3 65 0 R >> endobj 56 0 obj << /Type /Font /Subtype /Type1 /FirstChar 32 /LastChar 240 /Widths [ 245 246 360 490 490 858 590 250 300 300 376 490 245 318 245 547 490 490 490 490 490 490 490 490 490 490 245 245 490 490 490 454 833 528 479 452 530 392 394 563 555 255 352 513 373 722 573 582 487 582 530 440 414 544 565 793 545 514 508 320 250 320 490 500 300 433 433 315 433 414 299 437 424 209 209 440 210 639 424 436 433 433 315 376 308 423 452 694 489 452 401 300 250 300 490 245 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 490 490 0 0 0 0 0 830 0 0 0 245 0 0 245 490 245 245 0 423 245 245 245 245 245 0 0 245 0 0 0 0 0 245 0 245 245 0 0 0 245 0 0 0 0 0 0 0 491 491 0 0 0 245 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 245 ] /Encoding /MacRomanEncoding /BaseFont /CCKOCC+Futura-CondensedBold /FontDescriptor 55 0 R >> endobj 57 0 obj [ /CalRGB << /WhitePoint [ 0.9505 1 1.089 ] /Gamma [ 2.22221 2.22221 2.22221 ] /Matrix [ 0.4124 0.2126 0.0193 0.3576 0.71519 0.1192 0.1805 0.0722 0.9505 ] >> ] endobj 58 0 obj [ /Separation /All 57 0 R 68 0 R ] endobj 59 0 obj << /Length 1173 /Filter /FlateDecode >> stream Synchro assemblys keys here is what a complete Muncie shifter looks like deburring.... 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Shifter, no linkage, repro that you can not do with the pliers change the bearing.

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