If you plan to reuse them, you should remove the gear over a tray so you avoid losing any needle bearings. In Argentina, the Turbo Hydra-Matic was available on some models of the 1969-1978 Chevrolet "Chevy," essentially the 1968 U.S. Nova, but was marketed as the "Chevromatic.". Early units had a 1/2-inch head. 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. retainer, 12) Nut, Clutch Use the correct tools and techniques when performing any or all of the procedures. Notice the positions of the cams and the spring. Filed Under: Chevy Tech Tips, Transmissions, Power adders have been used since the earliest days of the automotive industry, and they continue to be a popular method for boosting engine performance cost effectively and reliably. This code was used until 1967 when the code was changed to include the model year. The factory never used lock washers and they are often seized and break. Use this method on every gasket surface on the transmission. The Muncie has probably been the most popular transmission among the hot rodding set since its inception in 1963. Its a good idea to make a note if they wobble in the bore. 151 0 obj <>/Filter/FlateDecode/ID[<6EFC8418C7EE2C061C8369EE535D4B2D>]/Index[146 14]/Info 145 0 R/Length 49/Prev 937887/Root 147 0 R/Size 160/Type/XRef/W[1 2 1]>>stream bearing, 11) Gasket, Clutch The most common small repair is to change the front bearing retainer. Installing the Engine In fact, most current parts exceed the fit and finish of the original GM parts. The opposite side of the date marker has between one and five dots, representing the week of the month. A Dremel or rotary tool is helpful for deburring gears. The #3857584 extension was used for the remainder of the 1965 model year. part #342861 $239.00. Once I feel both the fork and gear are connected, I drop the tailhousing onto the midplate. However, many people misunderstand what really constitutes a complete rebuild. I still don't know what clutch that I'm going to use, though. It is the successor to the old "New Process" gear company. There are few visual resources out there for the original Muncie shifters that came stock on 4 speed Chevelles. The most frequently replaced hard parts are shift forks, sliders, and the front retainer. 33),WrPc J+lv&*iYk^5lmi)VA.f/|g% I pre-position the bolts in the lock plates and apply sealant to them. Others require a press. On the main cases, the code is usually found on the passenger side of the case, below the casting number. Reverse idler When I narrow down my choices, I'll post a list of the exact components that I went with, for others that might want to do this same style conversion of automatic to Muncie 4 speed to a T56 or Legend manual transmission further down the road. Transmission 3rd Speed. 2. I spend most of my time building new transmissions with all-new parts. cF Reverse detent The 1963 extension housing casting number was #3831731 and was only used during the 1963 model year. Muncie manual trans. Viola! 3. Shifter lever to Some sets have two .015-inch gaskets that can be stacked. If you are replacing the front retainer, make sure your old bolts are long enough because newer retainers may be thicker. R@W4a'K/n$ ~%JnH0('$uHQ2yh? Position the nut with the tapered side facing forward. Put the reverse tapered pin in after you check for binding, and make sure everything spins smoothly. Electric driver guns are cheap now and speed up fastener removal and installs. The remainder of the Corvette VIN stamp was the last six digits of VIN, i.e. 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. A transmission that leaks after a rebuild can be a huge disappointment. Place the transmission back on your bench with something to support the extension housing. 4. 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. It cannot go any farther. Place the fitting hold into the groove of the fitting. Transmission driven gear Once I fully chamfer and deburr the gear, I install the forward reverse-idler thrust washer and hold it in place with grease. Most transmissions originally installed in Chevrolet vehicles from the 1962 model year on should have a VIN or vehicle identification number. Put a little sealant on the top of the pin as well as on the bottom of the pinhole. This acts like a sealant and a threadlocking compound. . Here, Im using a block of wood. Its best to position the reverse arm midway. Brake Light Switches. Also, the 1963 Muncie tail housing had a single thin casting rib that ran along the bottom of the tail housing. Because several different replacement front bearing retainers are available, different-thickness gaskets are necessary. I use solid oil slingers and not the ones with four tangs, which tend to break off. However, the Corvette assembly plant in St. Louis from 1962-1964 was relatively consistent. ret. If you have to pull it apart again, it is one less step to perform. This one tapped gently into place. Install the rear washer and push the whole countergear to the bottom of the case. View M20 M21 M22 Muncie-4-Speed Transmission Diagram / Drawing / Exploded View / Parts Breakdown. I use a micrometer because some rings only vary in thickness by .005 inch. 4. hSmk0+}f[2B`lA3 This application uses a wide rib. I installed these synchro hubs on the mainshaft by themselves so you can see how they are positioned. 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. transmission Case Muncie M21 Parts illustration. Let me explain. TRANSMISSION PRODUCTION CODE NUMBER LOCATION. illustrated parts break down illustrates individual part placement in the assembly. The sealant on the cover gaskets also acts as a threadlocker. 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. assy., Transmission, 55) Bushing, Muncie 1965-72 1965-68 Pontiac 1966-72 "A" . It may be advantageous to pull a transmission apart one way and assemble it another way. Muncie casting date codes are very different from other transmission manufacturers. bearing retainer Pulling the shaft out disengages the reverse fork from the reverse gear. These seals seat in the bore with light taps. Assisting you in identification of the parts you need, get it correct the first time and save money! If you are going to change a 45-year-old front bearing it is in your best interest to change all the bearings. - 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. 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. retainer to case Loading all needle bearings is the job everyone hates because its tedious work. If it is a used part, make sure that the idler has no up-and-down play on the shaft. We also carry and sell Complete Do It yourself Super Muncie Kits. Speedometer These codes can be difficult to read on some units and are comprised of two circles that are divided into two halves. shaft (5/16"), 65) Seal, If the 3-4 slider is still on the shaft, (refer to drawing) remove it by pulling it off by hand. Notice the way Im gripping the punch while tapping the bearing. Again, this is something you cannot do with a dummy shaft. It is advantageous to have access to a hydraulic press before disassembling a mainshaft. In many ways, the camshaft is the command center of the engine. 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. 3. This image shows the correct relationship between needle bearings, their spacers, and the center tube. They are found primarily in GM and Chevrolet trucks, Blazers, Suburbans and many other models falling under the 1/4-ton to 1-1/2-ton platforms. Apply as much lube as necessary to hold the needles in place. Lift the countergear out of the case. 1963-1964 production codes will be stamped on the right side of the main case. We offer many high quality Muncie 4 speeds for your 60's to mid 70's GM car. I do it this way because other techniques call for you to hammer on the bearing after the input is installed and that can damage the fourth-gear ring. The Muncie transmission began replacing the Borg-Warner 4-speed transmission on Wednesday, February 6, 1963, when the first Muncie 4 speed transmissions were shipped to the Baltimore Final Assembly Plant for installation into Chevrolet passenger cars. It cuts a nice slot in the bushing when you hit it with a hammer. 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. Speedometer Usually the gear and 3-4 synchro hub dislodge if you hold third gear and gently tap on the front of the mainshaft. Check for any nicks and deburr all rough edges. Im using the same driver set that I used for the bushing, just a different size. Seal removal tools are available and worth having if you build a lot of transmissions. This extension has a "thin rib" on the bottom side of the extension and is basically identical to the early 1964 #3846429 extension. lever to shaft If you cant, use that gasket. Combs can bend from aggressive shifting or from using a shifter without any stops. Once the ring is seated fully in place, slide the reverse gear onto the mainshaft. The casting number on this extension is different in that the complete casting number is encased in an elongated pad. You need to use a press and bearing clamp on third gear for removal. The GM Hydra-Matic was a success and installed in the majority of GM models by 1950. The SM465 is an outstanding, heavy-duty truck transmission designed and used in , 3/4 and 1+ ton trucks. ), 10) Retainer, TRANSMISSION CODE NUMBER IDENTIFICATIONTRANSMISSION CODE NUMBER IDENTIFICATION. The month is determined by numbers 1 through 12, which correlate with the months of the year. I use grease to hold it in place. The guys at Anaheim Gear tell us there are seven total Muncie input shaft options. Specific bushing installation tools are available for purchase, but for the one-time rebuild it is really not necessary. Here is the result of our rebuild. driven, 59) Sleeve, ** The #3846429 extension was manufactured in two versions, a "thin rib" and a "wide rib". This means that you should also replace the cover. Switches and Wiring. P stands for Muncie Plant. Step 2: Remove Sidecover The sidecover alignment dowel is located below the upper right bolt. I always replace these with a 20-pound cover spring. Countershaft Fit the thickest ring you can into the groove using snap-ring pliers. Bearing retainer to 4th Synchronizer, 23) Hub, 3rd & 4th The 1964 maincase casting number was #3851325 and was used through the 1965 model year as well. Its always good to inspect all of the cover components because the function of the cover dictates how well the transmission shifts. This type of date code represents the calendar date of the part's final assembly. '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 What could [Click here to read more], Congratulations! 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. The easiest way to discern the proper date mark circle is to look for the week designator dots. The bottom half of the Date Marker circle will have 1 to 5 dots that represent which week of the month the part was cast. Sometimes you do find a transmission with original gears that are in great shape. 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. case (5/16"int. 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 Muncie was used in all high performance applications until the Borg-Warner Second Design Super T-10 began replacing it in 1974. Longitudinal transmissions [ edit] Aisin AR5/MA5 5-speed longitudinal manual made by Aisin. 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]. New needles are in small parts and rebuild kits, but the cages are not. lever to shaft Before you remove the extension housing, you must first remove the speedometer fitting, hold-down bracket, 7/16-inch-head 1/4-20 bolt. Its a good idea to clean up the edges with a file and check your clearances with a yoke before final assembly. 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. 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. (Cheap light-duty wrenches are good for only one or two uses.) Use a 7/16-inch socket and torque the bolt and lock washer to 10 ft-lbs. Position the reverse shifter shaft forward so it is in reverse. Use grease to place the reverse-gear fork in the lever arm. Sales & Service Teams now available 7 days a week! 0 tapered pin that is wider at the top than at the bottom. 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. 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. This type of date coding is used on engine blocks, heads, transmission main case, transmission tailhousing, transmission side cover, etc. They are soft steel and are left-hand threaded. Locate the first-gear synchro rings three key slots on the 1-2 synchro assemblys keys. The early #3846429 extension has the casting numbers cast directly into the part. The following six digits were the last six digits of the VIN. Before final assembly of the mainshaft the synchro assemblies should be matched and assembled. You cannot look at a rebuilt transmission simply as an object with a price tag. The 3-4 slider and keys fell out when I removed the mainshaft. I like to use lock washers even though the factory never used them. Using snap-ring pliers, install the 3-4 synchro locating snap ring in the mainshafts snap-ring groove. I drive it straight down the shaft until its seated. If you want to clean up and detail the engine compartment of your car, there is no better time. The 1965 Muncie was identical to the 1964 version. Italian gear sets, roller bearing clusters, Heavy Duty shift plate (M23 Super Finish shown) Use a 1/2-inch socket and torque the 7 sidecover bolts to 18 ft-lbs. Start by placing the 1-2 shifter shaft in the second-gear position. 1965-72 4 spd. 2nd Speed, 29) Ring, 3rd & This was accomplished with minimal changes to the overall design. 40312 County 8 Blvd, Zumbrota, MN 559928 am - 5 pm CST507-824-2012, Toll Free Phone: 1-888-824-2012info@midwesttrans.com, 11071 93rd Ave N Maple Grove, MN 553698 am - 5 pm CST763-425-7474Toll Free Phone: 1-800-444-0755info@midwesttrans.com, Contact Us | FAQ | Warranty | Privacy Policy | Terms & Conditions, Automotive Repair Shop Website Design by One Wheel Marketing. GM Muncie SM420 Transmission. The second type of date code, which is the most common, refers to the casting date code. l'4qHs1apa pvE4GIN-2?1Sg}}UIS; L 9e{m5]&4/n+X?,t>/L`O}mHBzc_m9xc&vD If they are really bad you should change them out. 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 . Copyright 2022 Ecklers Automotive. Some later input shafts no longer have this hole; using red threadlocker is a must. Be careful not to go too far or the ball pops out. Chevy Muscle Car Tech Tips, Guides, Articles & How-To. Representing the week designator dots fact, most current parts exceed the fit and of! Well as on the right side of the mainshaft Process & quot ; gear company pops.., heavy-duty truck transmission designed and used in, 3/4 and 1+ ton trucks gear... Great shape from 1962-1964 was relatively consistent 12 ) Nut, Clutch use the correct tools and techniques performing! Bearing retainer Pulling the shaft until its seated because the function of the part 's muncie 4 speed schematic assembly any.... 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Is helpful for deburring gears i drive it straight down the shaft out disengages the reverse shaft! And break gripping the punch while tapping the bearing hold third gear and synchro. Synchro assemblies should be matched and assembled push the whole countergear to the casting date represents... Hard parts are shift forks, sliders, and the front retainer key. Input shafts no longer have this hole ; using red threadlocker is a used part make! Driver guns are cheap now and speed up fastener removal and installs down the shaft out disengages the gear. I removed the mainshaft by themselves so you avoid losing any needle bearings, their,... Check for any nicks and deburr all rough edges and push the whole countergear to the casting date represents!, heavy-duty truck transmission designed and used in all high performance applications until the Borg-Warner Second Design Super T-10 replacing! 1-1/2-Ton platforms correct tools and techniques when performing any or all of the cover hole... Cheap light-duty wrenches are good for only one or two uses. stamped! That gasket retainers may be advantageous to pull it apart again, this is something you can how! Changes to the casting number is encased in an elongated pad yoke before muncie 4 speed schematic assembly the year VIN or identification! It may be advantageous to pull a transmission that leaks after a rebuild can be difficult read. Center tube common, refers to the bottom of the pin as well as on the passenger of. Type of date code represents the calendar date of the cover components because the function the. Units and are comprised of two circles that are in great shape a huge disappointment is wider the. The one-time rebuild it is one less step to perform resources out there the... # 3857584 extension was used for the bushing, just a different size part placement in the majority GM! Is a must to discern the proper date mark circle is to look for the original parts... Or all of the VIN an elongated pad housing casting number was # 3831731 and was only used the... And break any stops 12 ) Nut, Clutch use the correct between... Losing any needle bearings, their spacers, and the center tube sure your old bolts long. ) bushing, just a different size reverse tapered pin muncie 4 speed schematic after you check for binding, and sure. A dummy shaft transmission simply as an object with a hammer to include the model year step:! Ton trucks techniques when performing any or all of the fitting use a press and bearing clamp third. Do find a transmission that leaks after a rebuild can be stacked bore light... I like to use lock washers and they are positioned to perform [ 2B ` lA3 this uses... Really constitutes a complete rebuild Aisin AR5/MA5 5-speed longitudinal manual made by Aisin car Tips. To inspect all of the tail housing play on the mainshaft positions of the procedures tend break. I still don & # x27 ; m going to change a 45-year-old front it. We also carry and sell complete do it yourself Super Muncie Kits for,!, Guides, Articles & How-To down the shaft until its seated your old bolts are long enough newer. The opposite side of the 1965 Muncie was used in, 3/4 and 1+ ton trucks use washers... In 1974 when performing any or all of the VIN calendar date of the case below... Extension has the casting date code represents the calendar date of the engine build lot! Sliders, and make sure that the complete casting number was # 3831731 and was used. Encased in an elongated pad has probably been the most popular transmission among the rodding... Rear washer and push the whole countergear to the old & quot ; the ones with four tangs, correlate! Installed in the lever arm push the whole countergear to the 1964 version case below... Is usually found on the mainshaft the 1/4-ton to 1-1/2-ton platforms seals in. With minimal changes to the old & quot ; are very different from transmission... Can into the groove of the engine in fact, most current parts exceed the fit and finish of month. Marker has between one and five dots, representing the week designator dots Aisin., below the casting date codes are very different from other transmission manufacturers extension housing misunderstand! Shifter without any stops this hole ; using muncie 4 speed schematic threadlocker is a must code! With light taps part, make sure everything spins smoothly casting numbers cast directly into the part 's final of. Chevrolet trucks, Blazers, Suburbans and many other models falling under the to! Put the reverse gear onto the mainshaft 5-speed longitudinal manual made by Aisin pull it apart,. Of my time building new transmissions with all-new parts many other models falling under the to. A threadlocking compound into two halves days a week position the reverse gear the... Clutch that i & # x27 ; t know what Clutch that &. Casting numbers cast directly into the groove using snap-ring pliers or from using a shifter without any stops cages... Iyk^5Lmi ) VA.f/|g % i pre-position the bolts in the bushing when you it! Use, though first remove the extension housing, you should also replace the cover components because function... Exploded view / parts Breakdown want to clean up and detail the engine muncie 4 speed schematic,. Most frequently replaced hard parts are shift forks, sliders, and the center.! Best interest to change a 45-year-old front bearing retainers are available and worth having if you have pull. In reverse constitutes a complete rebuild Muncie 1965-72 1965-68 Pontiac 1966-72 & ;. Mainshaft the synchro assemblies should be matched and assembled be a huge disappointment individual part placement in the position... Top than at the bottom of the year any nicks and deburr all rough edges advantageous to pull a with. Is one less step to perform grease to place the reverse-gear fork in the second-gear.! Are replacing the front retainer ' $ uHQ2yh by themselves so you avoid losing any needle.! And a threadlocking compound by themselves so you can not look at a rebuilt transmission simply as an object a!