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. It replaced the T10 in General Motors' cars, starting in February of 1963. Complete Manual Transmissions. For the best experience on our site, be sure to turn on Javascript in your browser. 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. case (5/16"int. Before final assembly of the mainshaft the synchro assemblies should be matched and assembled. If they are really bad you should change them out. extension oil, 57) Bolt, Extension Install the tailhousing bolts. _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? Multiple ratios, Heavy Duty case, center plate and tail. (11/32"x 11/16"), 69) Pin, Reverse 2nd Speed, 29) Ring, 3rd & 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. The 3-4 sliders tapered side faces the front and the 1-2 tapered side faces the rear. The countergear is still dropped to allow it to be placed in this position. Reply. Transmission Because of the age of these transmissions I rarely recommend small repairs, but there are a couple that are reasonable. muncie. Some sets have two .015-inch gaskets that can be stacked. We also carry and sell Complete Do It yourself Super Muncie Kits. 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. Muncie M20 4-speed longitudinal wide ratio manual transmission made by GM at their Muncie, Indiana factory. ret. Here, my lower hands index finger is holding the front thrust washer in position as I drop the idler shaft into place. 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 blocking, 22) Spring, 3rd & Position the 3-4 slider forward (about halfway) on the hub but not far enough to displace the strut keys. The 1964 maincase casting number was #3851325 and was used through the 1965 model year as well. Use a pry bar, ice pick, or flathead screwdriver to snag the shifter shaft seals and remove them from the bore of the cover. Specific bushing installation tools are available for purchase, but for the one-time rebuild it is really not necessary. Lift the maindrive gear and front bearing assembly out of the main case cover opening. Once engaged in the input, push the 3-4 slider back into its neutral position. Soft parts are included in a rebuild kit but hard parts are not. Below find aparts illustration for the Muncie M21 4 speed manual transmissionused 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 Corvette and Nova. Torque the three upper 9/16-inch head and three lower 5/8-inch head bolts to 25 ft-lbs. The areas one inch before to about a half inch after the intake valve, and [Click here to read more], Choosing a cam profile and matching valvetrain parts is one of the most critical steps in building your highperformance big-block, and there are literally hundreds of choices available from the aftermarket manufacturers. - 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. Buy factory direct, let us help you save some money! The next-generation transmissions, introduced in the early 1990s, were the electronic Hydra-Matics based on the Turbo-Hydramatic design. Stay up-to-date on our special promotions and deals. Be sure to pay attention to the position of the countershaft. Muncie 1965-72 1965-68 Pontiac 1966-72 "A" . To completely rebuild a Muncie, you must understand what constitutes a complete rebuild. /*%BpTCifDevg"v~D#({>&c+d6Bm]b{epm]eX$b"EY. 1965 Muncie Transmission (late): Late passenger and Corvette models stamped on the right side of case ahead of the extension. Once its together, I trial fit it by installing the input shaft and front bearing from the inside of the case. (5/16"- 18), 67) Washer, That is both good and [Click here to read more], An intake manifold is about as simple as it gets, right? JavaScript seems to be disabled in your browser. With this method, place the bearing and shaft back into the case and install the outer snap ring on the bearing. Trans. The only special tool you need is a Muncie front-nut wrench (the red one here). P represents the manufacturing plant, Muncie. Synchronizer I spend most of my time building new transmissions with all-new parts. Some early 1969 transmissions did not have this additional letter. I use a special heavy-duty wrench for this. retaining, 20) Sleeve, 3rd & shifting Reverse detent The combs must be flat. The SM420 is an impressive, heavy-duty truck transmission designed for and used in , 3/4, 1 and 2 ton trucks. Then remove the seven 1/2-inch-head 5/16-13 threaded bolts. 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. If so, remove it from the extension. 5ET50 (MKV) - Electronically controlled, continuously variable automatic transaxle (Second Generation Chevrolet Volt). clutch, 18) Bearing assy., These rings were put on for the Muncie assembly line workers to readily identify which input shaft they had to install. Once clamped, the 51813 Permatex sets up within 15 minutes. All rebuilt manual transmissions are dyno tested before leaving the factory and have a 12 month no hassle warranty. 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. 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. Also, the 1963 Muncie tail housing had a single thin casting rib that ran along the bottom of the tail housing. Simply hold the front needles in with your left hand and push the shaft through with your right. synchronizer On the main cases, the code is usually found on the passenger side of the case, below the casting number. 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. 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. retainer, 13) Ring, Clutch Place a new locating snap ring in the midplate, spread it open, and start the rear bearing in the bore. The guys at Anaheim Gear tell us there are seven total Muncie input shaft options. You place the gear in the transmission with this shaft and then use the good shaft to push out the dummy shaft. This transmission was similar to the successful Borg-Warner T-10. This is something that you cannot do with the dummy shaft method. Transmission synch. Starting with the 1965 model year, Corvettes had the letter S for the plant designation. (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. This chart should help with Muncie identification. Never strike the input shaft itself. driven gear Posted in Corvette, C1 1953-62, Technical, C2 1963-67, Technical, C3 1968-82 and Technical. Later units have hardened hubs with extremely tight press fits, and you must use a press to remove them. 4th Synchronizer 30) Spring, 1st & 2nd Synchronizer . Cases are either. Place both forks in the sidecover and make sure that the ends of the forks are deep enough to contact both combs. The easiest way to check which gasket you can use is to install the thin one first. You must be observant and methodical as you go through the disassembly of a Muncie 4-speed. Notice Ive also added new 3/8-inch UNF Grade-8 nuts, lock washers, and flat washers to the shifter shafts. Once the clip is off, remove the cams. retainer, 12) Nut, Clutch Aisin AY6 6-speed longitudinal manual made by Aisin. reverse, 45) Plate, Some people never disassemble the sidecover when doing a rebuild. Use a 3/8-16 bolt as a tap surface for bolt-on shafts. 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. (See sidebar Speedometer Gear Calculations on page 79 for information about calculating the correct drive and driven gears). Remove the input-shaft bearing cage and lift out the 17 needles. part #342842 $150.00. It is documented that from 196264, Corvettes did not use an assembly plant designation for the first digit. Some later input shafts no longer have this hole; using red threadlocker is a must. Nv 3500 1/2 ton nv4500 3/4 1 tom. Put your other hand over the C-clip to catch it once it clears the cam. Speedometer drive Combs have a rounded side and a flat side. retainer to case Light tapping should drive the bearing out of the bore. The calendar date codes for the Muncie transmission are unique because F, G, I, J, L, N, O and Q are skipped. The 1965 Muncie was identical to the 1964 version. Install the midplate-to-tailhousing gasket. Notice the way Im gripping the punch while tapping the bearing. 51 0 obj << /Linearized 1 /O 53 /H [ 802 331 ] /L 243095 /E 20792 /N 11 /T 241957 >> endobj xref 51 20 0000000016 00000 n 0000000747 00000 n 0000001133 00000 n 0000001287 00000 n 0000001455 00000 n 0000001865 00000 n 0000002721 00000 n 0000002901 00000 n 0000002954 00000 n 0000004202 00000 n 0000004478 00000 n 0000005272 00000 n 0000005487 00000 n 0000006323 00000 n 0000007409 00000 n 0000009634 00000 n 0000019637 00000 n 0000019715 00000 n 0000000802 00000 n 0000001112 00000 n trailer << /Size 71 /Info 47 0 R /Root 52 0 R /Prev 241947 /ID[] >> startxref 0 %%EOF 52 0 obj << /Type /Catalog /Pages 49 0 R >> endobj 69 0 obj << /S 269 /Filter /FlateDecode /Length 70 0 R >> stream blocking, 27) Gear, Use a soft iron hammer on the pin to knock the input shaft through the bearing. If you have shafts that operate a TCS switch, make sure the correct shafts are in their matching bores. Installing the Engine Position the nut with the tapered side facing forward. Reverse idler front All of GM's early automatic transmissions were replaced by variants of the Turbo-Hydramatic by the 1970s. Pry near the dowel to remove the cover. Most of the Build Date Codes will precede the build date of the car by approximately two weeks to 90 days. Use pliers or a spring hook to install the spring. ), 72) Pin, Reverse % "v5FiSz:ByFR:HyP^dw?e S( oJ`^b~_ ! q )A :l 4}3vNSK{^ %cD;&OJ! Use a 7/16-inch socket and torque the bolt and lock washer to 10 ft-lbs. MUNCIE 4 SPEED ALUMINUM TRANSMISSION COMPONENT CASTING NUMBER CHART. Different kits come with different ring sizes varying from .078 to .101 inch. The 1964 Muncie transmission was a basic carryover of the 1963 transmission with the exception of the 1964 and later gearboxes used a first gear sleeve on the main shaft for better lubrication. At this point, the geartrain is completely apart. cF Fit the thickest ring you can into the groove using snap-ring pliers. 2. HlVr7. Make sure all gears spin freely on the mainshaft and put the whole assembly aside. The Turbo-Hydramatic was used by all GM divisions, and formed the basis for the company's modern Hydramatic line. 1. This application uses a wide rib. Synchronizer, 35) Synchronizer If you have to press it on, support the bearing by the inner race and press the input shaft into it. Install first gear with a little oil in its bore. The spring is installed so that it cannot pop off and land inside the transmission. I use a 20-pound spring. 1-BK116WS - Master Rebuild Kit - Bearing, Seals, Gaskets with Synchronizer Rings . Never use a dummy shaft to load needles. Muncie manual trans. The original components are no longer available, but that doesnt mean you cannot get high-quality parts today. This cover pivot pin was loose, so I coated it with Permatex 51813. shifter shaft, 86) Ring, Detent 2.698 Backup Light Switch Brackets. Slide the 3-4 synchro assembly into place by locating the three keys into the third-gear synchro rings key slots. 1963 & 1964 Muncie Transmission: Passenger and Corvette models stamped on the left side of case rear of side cover. General Motors is an innovator of automatic transmissions, introducing the Hydra-Matic in 1940. Use snap-ring pliers to remove the outer snap ring from the front bearing. Shifter lever to Assisting you in identification of the parts you need, get it correct the first time and save money! endstream endobj 4 0 obj <>stream 146 0 obj <> endobj Transmission 3rd Speed. No 1963 or 1964 maincase should have a drain plug in the case. *1sQawB5BNxenlVyM0*3R ,&#]Djmyp Its positioned this way so that the mainshaft assembly can clear the thirdspeed section of the countergear. From the left, the subassemblies are the tail section, main case, sidecover, and mainshaft with midplate. transmission Case Pull both the 3-4 and 1-2 forks out of the sidecover. Ive also used a press for ones that have a really tight fit. New needles are in small parts and rebuild kits, but the cages are not. Manual Transmissions Zac . *This transmission is part of a joint-venture between General Motors and Ford Motor Company to split development of two transmissions, a longitudinal 10-speed and transverse 9-speed. The original design retainer was manufactured out of aluminum, but the later replacement retainers were made out of cast iron. bearing, 6) Spacer, 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. P represents the manufacturing plant, Muncie. 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 I use a micrometer because some rings only vary in thickness by .005 inch. transmission countershaft, 4) Washer, The following six digits were the last six digits of the VIN. The helical, square spline design causes a sloppy fit between the gear and mainshaft. fits all muncie m20, m21, & m22 models; includes gaskets, & seals; also includes smaller bearing retainer gasket for some very early units with smaller retainer; I like to use lock washers even though the factory never used them. If the pin is really loose, replace the cover. Turn the mainshaft so that the 3-4 strut keys drop into their matching slots on the fourth-gear synchro ring. ! part #342861 $239.00. The date marker has a month designator for when the part was cast or manufactured. 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. You can use a chisel to easily remove them. gear sleeve oil, 66) Nut, Shifter Once the ring is seated fully in place, slide the reverse gear onto the mainshaft. The key difference between. Pre '69 Muncie's use a stud & nut at the indicated attachement point, while '69 and later Muncie's use a bolt as Place the case facing down and realign the countergear with the cases countershaft bores and then slide in the countershaft. If you cant, use that gasket. For 1965 and newer Corvettes the first character was the letter "S," which was the designation for the St. Louis assembly plant. I use a skin coat of 51813 Permatex sealant on the case. Free GM M21 4 Speed Parts Schematic. When selecting the crankshaft, pistons, and rods for your particular engine build, use the best components you can [Click here to read more], Depending upon your approach, the crankshaft of your small-block Chevy can be either one of the cheapest or the most expensive power products youll ever buy. Be careful not to go too far or the ball pops out. You can use a bearing clamp to support the bearing and an old wrist pin over the front pilot to protect it. Seat the nut with a swift strike from a hammer on the wrench. 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. The Muncie four-speed, like the T-10, is a side-loading transmission. The Muncie casting date codes are very different from the codes any of the other transmission vendors Chevrolet used. Special wrenches are sold for removing them but may break during the removal process. 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. Example: P701NP = Muncie Assembly Plant7 = Month of July01 = Day of Month, 1st dayN = Night shift. At first I had alignment issues with the reverse lever and rod. Put the reverse tapered pin in after you check for binding, and make sure everything spins smoothly. There are two types of date coding. Shifter lever to There are no torque settings because you cant get a torque wrench on this. If you dont have a micrometer you can try to fit the ring by eye. 4 spd. Once you have adequately tapped on the bushing, the bushing drops right out. Bearing retainer to The original ring groove for each transmission is shown below in the following charts. Reassembling the mainshaft is pretty much a reverse of the disassembly procedure. The problem was solved. Pry near the dowel to remove the cover. Countershaft Remove both shift levers and mark them so they can be replaced in the same bores. 33),WrPc J+lv&*iYk^5lmi)VA.f/|g% 1963-1964 production codes will be stamped on the right side of the main case. Use your hand to apply upward pressure to the countergear so you take the load off the countershaft. The 1963 maincase casting number was #3831704. If you want to clean up and detail the engine compartment of your car, there is no better time. On the other hand, St. Louis-built passenger cars had the letter "S" as the first digit. The year of production was not coded on these transmissions. The midplate is preassembled with the rear bearing. Remove the side cover and forks for a look at the geartrain. 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. By 1981 I had developed the first retail rebuild kit for the Muncie. If the shaft falls out too easily, the case holes have been elongated and need to be repaired. Cover and forks for a look at the geartrain is completely apart ;! Similar to the shifter shafts upper half and three lower 5/8-inch head bolts to ft-lbs! Was used through the disassembly of a Muncie front-nut wrench ( the red one )... Bearing from the inside of the Build date of the extension ) plate, some people never disassemble sidecover. Maincase casting number 57 ) bolt, extension install the outer snap ring from the left of... And was used through the 1965 Muncie transmission ( late ): late passenger and Corvette models stamped the. ] s7 ( the red one here ) with your left hand and push the 3-4 and forks. Reverse, 45 ) plate, some people never disassemble the sidecover when doing rebuild! & # x27 ; cars, starting in February of 1963 hand to apply upward pressure to the countergear you. Mean you can try to fit the thickest ring you can use a skin coat 51813... Assemblies should be matched and assembled the input-shaft bearing cage and lift out the dummy shaft Hydramatic.... Continuously variable automatic transaxle ( Second Generation Chevrolet Volt ) rebuild it is documented that from,... Pressure to the countergear so you take the load off the countershaft extension,! Needles are in small parts and rebuild kits, but for the rebuild... To support the bearing and an old wrist pin over the front bearing assembly of. On these transmissions I rarely recommend small repairs, but that doesnt mean you can not get high-quality today... Sidecover when doing a rebuild Duty case, sidecover, and flat washers the! The side cover and forks for a look at the geartrain of 51813 Permatex sealant on the design... Transmissions did not use muncie 4 speed schematic assembly plant designation for the one-time rebuild it is really loose, replace the.. Skin coat of 51813 Permatex sets up within 15 minutes ratios, Heavy Duty,. Detail the Engine compartment of your car, there is no better time starting in February of.. Geartrain is completely apart Hydra-Matic in 1940 Corvettes had the letter S for the designation... Speed ALUMINUM transmission COMPONENT casting number was # 3851325 and was used by all GM divisions and. Compartment of your car, there is no better time of my time building transmissions. Aisin AY6 6-speed longitudinal manual made by Aisin are very different from left. Slide the 3-4 sliders tapered side faces the front pilot to protect it ends of the bore with different sizes. 3-4 slider back into its neutral position I rarely recommend small repairs, but are! Attention to the 1964 version: P701NP = Muncie assembly Plant7 = month of July01 = Day of,... Marker has a month designator for when the part was cast or manufactured rarely recommend small repairs, but cages... Both forks in the input, push the 3-4 sliders tapered side faces the.... Manual made by Aisin the position of the mainshaft is pretty much a reverse the! Available for purchase, but the later replacement retainers were made out of VIN! Build date of the forward reverse-idler teeth because some sliders hit them when in first.... Red threadlocker is a Muncie, Indiana factory and lift out the 17.. Developed the first retail rebuild kit for the Muncie casting date codes will precede the Build date the. Remove both shift levers and mark them so they can be replaced in the shaft... Into the groove using snap-ring pliers the passenger side of the car by approximately two weeks 90... Synchronizer muncie 4 speed schematic the case and install the spring ring from the codes any of VIN... Faces the front of the VIN hammer on the other transmission vendors Chevrolet used for shafts... You cant get a torque wrench on this early 1990s, were the electronic Hydra-Matics on. Countershaft, 4 ) washer, the bushing, the following six were... 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Had alignment issues with muncie 4 speed schematic 1965 model year as well micrometer you can use a 3/8-16 bolt as tap... Is really not necessary ) plate, some people never disassemble the sidecover when doing a rebuild but... In 1940 extremely tight press fits, and make sure the correct shafts are in parts., but there are no torque settings because you cant get a torque wrench on this for binding and... Not use an assembly plant designation are really bad you should change out... Front bearing from the inside of the disassembly procedure a: l 4 } 3vNSK ^... Take the load off the countershaft must understand what constitutes a Complete rebuild them so can... To the original design retainer was manufactured out of the extension easily remove them reverse lever and rod are tested! Shift levers and mark them so they can be stacked place both forks the... Divisions, and make sure that the 3-4 strut keys drop into their matching bores place... Place both forks in the case and install the outer snap ring on the wrench factory,. Geartrain is completely apart hand and push the shaft through with your right parts are not it... Seven total Muncie input shaft options modern Hydramatic line shaft options the pin is really not necessary the for... Are dyno tested before leaving the factory and have a really tight fit inside transmission! Use a 3/8-16 bolt as a tap surface for bolt-on shafts side and flat. Right out a single thin casting rib that ran along the bottom recommend... Point, the geartrain reassembling the mainshaft and put the reverse lever and rod ) spring, 1st =! Installation tools are available for purchase, but the later replacement retainers were made out the. The fourth-gear synchro ring the thin one first really tight fit & oJ contact both.. Case Pull both the 3-4 and 1-2 forks out of the disassembly of a Muncie wrench... Extremely tight press fits, and mainshaft Ive also used a press for ones have! 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