9780800 Muncie 4spd Transmission-64-65 Wide (64.2% similar) Here are the numbers: id tag, indicates oem 1964 corvette or Chevalier possibly several other models inspection cover casting, tail case k stamping on main top rear lip, next to. The United States Census for 2010 reported the city's population was 70,085. BorgWarner was probably the foremost manual transmission manufacturer at the time, and basically wrote the book on manual transmission design. A service technician can use a scanner to find a VIN, and any known service issues are easily found. The problem is that some cars just aren’t driven very often. I believe the reasons for bringing the T10 to the Muncie plant were threefold. carb 350 and manual 4speed Muncie transmission. For prior years only a month and date were added. It was actually based on the T-10 design and uses the same basic gear layout. The service issues crop up after the warranty period has expired and the owner is left to pay for a repair on something that was defective in the first place. The new pin design simply added a hat to the end of the pin so it could not fall through. Muncie / ˈ m ʌ n s i / is an incorporated city and the seat of Delaware County, Indiana.It is located in East Central Indiana, about 50 miles (80 km) northeast of Indianapolis. With these changes and innovations, the Muncie ceased production and the Super T-10 was introduced in GM cars. The first-speed gear had a smaller bore diameter as well as a recess in the bore to clear the synchronizer retaining snap ring. The rectangular drive portion of the shifter shaft was also increased in length from .605 to .722 inch. Typi­cally, the seamless spacer had four needle-spacer rings. They were also featured in certain Corvettes from 1984 to 1988. End of an era today when smokestack comes down - StarPress Online (Muncie, Delaware County, Indiana) - Thursday, January 31, 2008 - By KEITH ROYSDON: A chapter in Muncie's long auto industry history is set to close today as the smokestack at the former Chevrolet plant on the city's south side is demolished. The Muncie 4 speed was a transmission that was used in General Motors (GM) between 1963 and 1975. This is an upgraded designed sleeve that provides better lubrication between the gear and the bushing. This is a pair of Muncie first gears.The gear on the left is the standardM20 and M21 and the gear on theright is the M22. Shot peening is a process in which the gear is blasted (like sand blasting) with steel shot. The Muncie design has roots going back to 1935. Although the Muncie 4 speed found it easier to handle engine's growing power, its design borrowed from that of the T-10 it was replacing and even used the same basic layout. The left shifter shaft has a 3/8-24threaded stud with machined flats onboth sides. • Aisin AR5/MA5 — 5-speed longitudinal manual made by Aisin These are the two types of sidecover pivot pins that were used. The early 1963–1965 ring had a tendency to crack at the strut key slot. ONLINE TRAINING. However, eventually Borg Warner manufactured replacement Super T-10s for Muncie gear boxes. This was not done on the M20 or M21 transmissions. The Muncie design has roots going back to 1935. These gear boxes were used when power levels exceeded the limits of the early Borg Warner T10 4 speed. The most common main case casting was 3885010. Get the best deals for muncie 4 speed transmission at eBay.com. Although heis seen with a 1957 Corvette, whichcame with a T10 4-speed, the designof the T10 and Muncie share thesame features. It’s quite common to see the switch plugged off or just filled with sealant. Muncie 4 speed transmissions were used in General Motors cars from 1963 to early 1975. $30.00 . Detroit Transmission PTOs . By 1975, power levels had dropped, and catalytic converters and smog pumps were introduced. They debuted in 1963 Chevrolet full-size cars and Corvettes, and they were originally available in two ratios, 2.20:1 and 2.56:1. The 1970 model was the same as the 1969, and 1970 proved to be a transitional year. POWER TAKE-OFF. Muncie 1st Gear 36 Tooth Auto Gear Italian or South Korean made. The difference is the notation on the drawing to add shot peening to the gears. Adapter clips are available to take up the extra spaceso you can use later arms on stud-type shifter shafts. To understand the evolution of the Muncie 4-speed you have to look at a series of engineering platforms that led to the final design of this transmission. A snap ring retained the first and second synchronizer assembly on the mainshaft. The output shaft was increased from 27 splines to 32. Both were derived fromthe same U.S. patent. The engineering change documentation for the M22 is dated December 12, 1964. From the 1960s until the late 1980s General Motors issued Technical Service Bulletins by mail or fax to alert dealerships of potential service issues. Transmission Manufacture: Model year and Physical Description: Find Parts MUNCIE (Light Duty) 1940-63 Cars, 1940-68 Light Duty Trucks: Parts List: 74 Cast iron case and extension housing with 4-bolt side cover. The diameter of the main case countershaft bore was officially increased to 1 inch. The cases have a distinctive similar size, shape, and cover-bolt pattern. The T10 front bearing size was reduced in diameter in 1963 only. It had three major service issues affecting 1984 and 1985 models. Pre ‘69 Muncie’s use a stud & nut at the indicated attachement point, while ‘69 and later Muncie’s use a bolt as illustrated on the right. With the power levels increasing in GM muscle cars the power capacity of the T10 also needed to increase. This larger diameter was necessary because the big-block and small-block engines were producing more power. Auto Gear sells them directly and also through approved distributors. Several NASCAR transmissions, such as the G-Force T101, are also T10-based. First released in 1963, the platform remains strongly supported nearly 60 years later. Fuel down the carb will start. Hurst Competition Plus shifters designed for earlier transmissions usually do not fit on these gearboxes. The SM465 is a top loaded, top shifting truck style transmission. This “layout” is a 4-speed transmission with four forward gear ratios in the main case, a midplate bearing support, and a reverse gearset in the extension housing. Join Group. They were used in many muscle cars and Corvettes. Both the M20 input shaft and front of the countergear were machined with thicker teeth. The center gear isfrom a BorgWarner T85 3-speed.The lower gear is the latest versionof the early T10 and the upper is theMuncie M22. By 1965 the shifter-shaft designs changed because they had been snapping. This is one of those undocumented parts that is not listed in all the parts books but takes some digging to find.Later you could get a roller bearing M22 firstgear assembly directly from Chevrolet (GM PN 3965752). The M20 gearset’s front end was also redesigned to handle more power. The final product, he said, was the transmission for light duty Chevrolet trucks. PTO QUICK REFERENCE. Thisgave it a thicker tooth profile. A Muncie differs from a Saginaw transmission in that its reverse lever is in the tail housing, not the side cover. PROMOTIONAL STORE. Muncie 4 speed Transmission parts,Gears,Bearing kits,Synchro rings and more!!!! These hubs fitextremely tightly on mainshafts, andyou need to have the proper pressclamps or pullers to remove them. The Muncie 4 speed,was first designed in 1963,and lasted until 1974. Typically, the M20/M21 gearsets have a first-gear helix angle of 26.4 degrees and an input shaft angle of 39 degrees. The serial number is a date code the transmission was built for a particular year. Today’s VINs (vehicle identification numbers) are even bar coded. First released in 1963, the platform remains strongly supported nearly 60 years later. Accessibility Help. Notice the difference in the drive slots of these arms. ARTICLES. Reduced thrust loading reduces heat and yields less horsepower loss to the rear wheels, but it increases gear noise. 44" super swampers Dana 44 front 14bolt rear coil conversion front suspension. 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. Before 1969, different internal steel drivegears were installed to match specific axle ratios and tire sizes. It’s a standard M20 model. The 1969 and later models use a bolt to secure the linkage to the transmission. It was press-fitted into the cover but it had a tendency to fall into the transmission. GM initially missed out on the T-10 redesign by Borg Warner, rechristened the Super T-10. There was little change to its basic design and operation; in retrospect, it was created to meet car needs at the time, if only for a brief period. Addingmore material in front of the teethreinforced the blocking rings. There seems to be no specific time when this change took place. 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 4 speed transmissions were used in General Motors cars from 1963 to early 1975. Click the button below and we will send you an exclusive deal on this book. The maindrive gear on the left is froma T85 3-speed. Unless you are a concours-style restorer, having a later-model transmission in your GTO is perfectly fine. In 1935, a man by the name of Lou Conne founded Muncie Parts Manufacturing Company or what is better known today as Muncie Power Products, Inc. 1970 Chevy Corvette Muncie 4-Speed Transmission parts in-stock with same-day shipping. The glory days of the 4-speed Muncie were over and BorgWarner once again was back in the saddle. It was obviously a move to save money and consolidate inventory since all transmissions would be assembled internally using all the same parts. (They are credited with hundreds of manual transmission patents.) These assemblies came with heavier strut key springs. I took the time to research the patent number that is cast into most Muncie … Jay Dowd > ‎UAW 499 - Chevrolet Muncie Transmission Plant History. The SM465 can be found in Chevrolet and GMC full-size trucks, Blazers, Suburbans, among other models.Some applications beyond one-ton pickup trucks came with larger input shafts. This means a transmission could be assembled in April with a 3925661 case and then in July with a 3925660 case. The middle gear is the laterstyleoriginal-equipment late-1964 to1974 gear. Auto Gear’s “Syracuse 4-speed” is a Muncie on steroids. In 2012, Motive Gear acquired Richmond Gear and they are still manufacturing the Super T10 today. With the quality of used Muncie transmissions getting worse in the last 10 years, the idea of making new improved Muncie parts was becoming a reality. Grobey and … The Muncie was never designed for that. The code has nine symbols that will reveal the GM division, year, model, assembly plant and car the transmission was used in. Those stamping numbers are: 3831704 - 1963 only 3851325 - 1964-'65 3885010 - 1965-'67 3925660 - 1968-'70 3925661 - 1971-'74 . You can copy and paste this link to share: https://www.chevydiy.com/muncie-4-speed-the-complete-history/b>. Discover Black History Makers. To discuss the history of the Muncie Chevy plant. A video with better audio of the nostalgic sound of a Muncie M22 (Rock Crusher) transmission at work in a 1966 Chevrolet Chevelle. $12.88 $8.88 $17.95. According to research by Alan Colvin (author of the Chev­rolet by the Numbers books), 57 M22 units were actually built for 1965 production. These proved to be very weak and were replacedby a cast-iron retainer (604932). The standard first-gear sleeve is on the top and the sleeve for the M22 is on the bottom (GM PN 3932228). (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. The seamedspacer tube used six. It appears that BorgWarner had an exclusivity contract with General Motors until 1960. (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 is a typical transmission controlledspark (TCS) sidecover. If you are going to switch extensionhousings so that you can use a passenger-sidespeedometer fitting, youmust make sure the mainshaft canaccommodate the different positionof the drivegear. Those stamping numbers are: 3831704 - 1963 only 3851325 - 1964-'65 3885010 - 1965-'67 3925660 - 1968-'70 3925661 - 1971-'74 . At this time, the Corvette had a 165-hp small-block engine, catalytic converter, and “unleaded fuel only” stickers on the gas cap doors. The center gear isfrom an early T10 and on the rightis an M21 Muncie gear. The Muncie design has roots going back to 1935. They are not; the Muncie evolved from the T10. A letter to Zora Arkus-Duntov dated December 8, 1964, is referenced in this engineering change stating successful use of the M22 in Grand Sport Corvette field testing. SHARE THIS ARTICLE: Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. Most of the later GM overhaul shop manuals show four spacers in the exploded-view diagrams when, in fact, the transmis­sions used six. This was the first year that the T10 was used in the Ford Galaxie and Fairlane. Typically, the strutkey springs had a lighter tension comparedto later styles. Hence the name “RockCrusher.” Muncie 4-speeds have varying helix angles in the gearsets. The introduction of the transmission controlled spark (TCS) switch on the Muncie sidecover seemed to appear in 1970. Steel shot is spherical and the gear surface develops thousands of microscopic dimples when the shot hits the gear. Discussion. The speedometer drivegear only came as a molded 8-tooth gear. The Muncie SM465 is a heavy-duty, four-speed manual transmission built by General Motors for use in light and medium duty trucks from 1968 to 1991. An axle ratio of 3.73 and higher usually came with a close-ratio transmission. This yields a slightly different M20 ratio set. CONNECT WITH MUNCIE POWER. Mixing late long-slotarms on early short-slot shafts causesthe linkage to go out of alignment. The history of hypnosis is full of contradictions. These transmissions have a long history of performance and durability, but of course, it’s a non-numbers matching GTO, so it does not enhance the value. The later slider had a smoother,ramped, strut key pocket. sort by: sale. The letter M was used to ID the Muncie plant for the Muncie 3 speed, so P was the next logical letter. Notice how theangle of the M22 gears is muchstraighter than on the ST10. Based in the D.C. area, Andy Joseph works full-time as a data analyst and technical writer. Home > Products > Power Take Off > Detroit Transmission Ptos; PRODUCTS. TheM22 is straighter. This was also the first year of “bolt-on” shifter shafts. This Tech Tip is From the Full Book, GM TURBO 350 TRANSMISSIONS: HOW TO REBUILD AND MODIFY. The SM465 can be found in Chevrolet and GMC full-size trucks, Blazers, Suburbans, among other models. There was little change to its basic design and operation; in retrospect, it was created to meet car needs at the time, if only for a brief period. This is the current Muncie M22.Your can see that the layout of thegeartrain is identical to the ST10’s.All gears and synchronizers are inthe same position. Chevy Muscle Car Tech Tips, Guides, Articles & How-To. I do not like them because, for the most part, they are admitting defects to a design. There are 2 basic ratios,close and wide. The upper shaft hasthe single position for the driver’s sideand the lower shaft has more areaadded to the back for the passenger’sside. Written by Paul Cangialosi and Posted with Permission of CarTechBooks. The new thread size of the stud was increased to 3/8-24. The 1969-and-up shaftsused a bolt-on style, which eliminatedbroken studs and stripped threads. The Magical Muncie 4-Speed Transmission. The roller first gear was designed to prevent gear seizures in high-speed road-race conditions. Many Corvette restoration books share the common misconception that the 4-speed T10 and Muncie are two separate entities. This transmission is 12 \" long and features a cast iron top cover that is retained by eight bolts. This was accomplished by reducing the input shaft tooth count to 21 from 24 and the countergear’s maindrive section to 25 from 29 teeth. The 1969 design changes were subtle, and now all models had drain plugs as a standard issue. Many people think the gearset had some different alloy compared to the standard sets, but it didn’t. Ran good last year carb is needing cleaning or rebuild. The choice of transmission usually was determined by the engine size and rear axle ratio. It is the principal city of the Muncie metropolitan statistical area, which has a population of 117,671. Any photos of my Dad Dickie Dowd out there? First gear also had a tendency to seize to the mainshaft. In the early 1980s I did a great deal of repair work for GM dealers nationwide for the Corvette 4+3 overdrive. The SM465 case is of cast iron. The far left gear is a 1963type that has the recess for the 1-2synchronizer snap ring and a smallerbore. The same alloy is used to manufacture the M20 and M21 gears. This is essentially an original 1964 442Oldsmobile Muncie casing with theoriginal factory shifter. In this video I rebuild a Muncie M20 transmission.https://patreon.com/user?u=4693723#muncie #transmission #1970chevelle396 The numbers 3831707 and the shifter linkage being attached with studs and nuts make this a side cover for an early Muncie. The upper tube has no seam but the lower one does. The newer 3/8-24stud still had to fit the rectangularkeyway of the linkage arm, and so ithad flats milled on each side, but theystill broke. To discuss the history of the Muncie Chevy plant. Four rows with 20needles per row were used. The tooth counts and gear pressure angles of M20, M21, and M22 gears are the same. It was held in place with a spring-steel clip. It had a thrust washer behind first gear that floated on the rear bearing inner race. The 1963–1965 needle countergearneedle bearing on the left is .156inch in diameter. Two major improvements were issued. Today I use a springthat has a tension between the earlyand late springs. The example on the leftis for pre-1969 transmissions and the one on the right is for those that accepta 3/8-16 threaded bolt. Fitment issues might arise when installing one of these transmissions in a pre1971 car. 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. 3.08:1 rear. The third reason was increased T10 royalty benefits. More M22s were produced from 1968 to 1970 than in any other period. Oct 27, 2020 - It is a good idea to understand the basics of your Muncie 4-speed before you start rebuilding the transmission. The front bearin… The RPO M22 stands for Heavy-Duty Close-Ratio. If you mix them up you end up with shifting problems. The Muncie was the top high-performance manual transmission General Motors offered in its muscle cars of the 1960s and early 1970s. Located in a section of the Plank Brothers building … GM Muncie SM420 Transmission. P stands for Muncie Plant. The first-gear thrust washer was eliminated and the gear was designed to have a thrust surface that ran against the rear bearing’s inner race. Muncie Transmission information D & L Transmission To order call 1-631-351-4837. Dawson credited Mike Jones, longtime leadership of the plant's United Auto … Email or Phone: Password: Forgot account? Has non-synchro 1st and a "barrel" type 2/3 assembly. GM's Muncie-built four-speed may be the most well-known manual transmission ever produced. This retainer was upgraded to cast iron by the end of the 1963 run. The Muncie was designed to shift better than the T10; it used larger-diameter synchro cones. If you liked this article you will LOVE the full book. Driver’s side of … From the left, thesmall 5/16-18 threaded stud, whichsnapped easily. It was no longer just an M22 thing. CODE OF ETHICS. Find great deals on eBay for 1966 muncie transmission. The input shaft spline count was increased from 10 to 26 splines along the same 1.125-inch-diameter shaft. On the one hand, a history of hypnosis is a bit like a history of breathing. Oct 27, 2020 - To understand the evolution of the Muncie 4-speed you have to look at a series of engineering platforms that led to the final design of this transmission. The Muncie case (3831704) replaced the T10 4-speed in the 1963 Chevrolet Bel Air and Corvette by mid-May of that year. This photo shows that the overalllength of the rectangular drive portionis longer on the bolt-style arm comparedto that of the stud type. Successfully diagnosing transmission problems is directly related to how well you understand how this transmission works. The second was that the first-speed gear now rode on a bushing that was press-fit onto the mainshaft. In 1963 the Corvette Grand Sport racing program was instituted. UPCOMING EVENTS. 1-16 of 162 results for "muncie rebuild kit" Skip to main search results Eligible for Free Shipping. Modern automation gives companies the ability to store incredible amounts of data; it’s much easier to track changes. 1.800.367.7867. Zora Arkus-Duntov wanted to use the design of General Motors’ employee James Fodrea. Make sure you order the propergasket and seal kits when rebuildingthese later units. All of thesegears have the same number of clutchteeth: 36. I’m not a fan of these but I do understand their importance. Muncie Transmission is back! For a video version of this article, click here. He has a master's degree in journalism and technology management. And beyond. Muncie 4 speed Transmission parts,Gears,Bearing kits,Synchro rings and more!!!! GM's Muncie-built four-speed may be the most well-known manual transmission ever produced. Filed Under: Chevy Tech Tips, Transmissions, M20 first, 2.56:1; second, 1.91:1; third, 1.48:1; fourth, 1.0:1; and reverse, 2.64:1, second, 1.64:1;third, 1.28:1; fourth, 1.0:1; and reverse, 2.27:1, GM TURBO 350 TRANSMISSIONS: HOW TO REBUILD AND MODIFY, Comparing Ignition Systems and Fasteners for Chevy Small Block Engines, Chevy 348-409 Camshafts and Valvetrain Guide, Ultimate Guide to Building Chevy-Big Blocks: Cylinder Blocks Instruction, How to Start Your C2 Corvette Restoration – Free Cheat Sheet, The Ultimate 348-409 Guide – Teardown and Inspection, How to Start GM Automatic Transmission Swap or Build, How to Correctly Select Wheels and Tires for Chevy and GM. To redesign the Muncie and downgrade it would have cost a lot of money. In 1964 and 1965, Muncies in some of the full-size Chevrolet Impalas and Pontiac Catalinas were equipped with longer mainshafts and extension housings to keep driveshafts shorter and reduce harmonic vibration. tpd pro-line. The slot on later arms always has a circular cutout tomake room for the bolt. The GM service manuals are interesting. Shifter linkage arms were changed because the drive slot now had to be longer to match the drive portion of the mating shaft. The 4-speed design of the T10 and Muncie is a very “forward” design. Facebook. This meant that the transmission’s front bearing retainer and register bore of the bellhousing were also smaller in … It is often very difficult to decipher what part numbers actually match the part you may need because the GM parts books have discrepancies. Notice the color differencebetween them. Detroit Transmission … The transmission was also 3/4 inch longer than older models. The Muncie saw many improvements during its 10-year production run with General Motors. The sidecoverpivot pin has no “hat” and can fall intothe transmission. By the end of 1974, Muncies were no longer being installed in GM cars. You have to purchase Hurst shifters intended for the make and model car that these gearboxes came in. UAW 499 - Chevrolet Muncie Transmission Plant History. Muncie 4 Speed Parts. He has been writing articles about technology, health, politics, music, culture and automobiles since 2007. The smokestack -- emblazoned with name Chevrolet -- is scheduled to be toppled around … The passenger-side speedometer extension housing also has added material between the upper shifter mounting holes. Sign Up. The early ring(right) had a problem: Cracks developedat the key slot. The United States Census for 2010 reported the city's population was 70,085. 5speeds is your online source for Muncie transmission parts,t5 transmission parts,borg warner t56,t10 transmission,super t10 transmission,3550 transmission parts,manual transmission parts,t56 transmission overhaul kit, t56 transmission rebuild,rebuilding Other muscle car transmissions of that era, such as the Ford Toploader and Mopar A833, left no room for improvements because of the layout and initial design of their geartrains. The final main case casting of 3925661 was introduced, but there are huge overlaps in date codes. The biggest change was the number of splines on both the input and output shafts. UAW 499 - Chevrolet Muncie Transmission Plant History. Many window and tank stickers exist from before 1966 that list cars as having M20s when in fact they had M21s. Webbing was added to the top and bottom. The switch isin great shape. Not for passenger car as some self proclaimed specialists may think. Because largerspline1971–1974 Muncies are largerin diameter, a different driveshaftyoke is needed. Typically,the seamless spacer had fourneedle-spacer rings. The synchronizer assemblies were also updated to what is commonly called a “shoulder style” synchro ring. Units from 1940-54 have enclosed driveline, otherwise known as a "torque tube". The 1968 model was identical to the 1967 model except for a main case casting alloy change. The synchronizer hubs had a very tight press fit to the mainshaft because the hubs apparently were nitrided. See Chapter 2 for more information on serial numbers. The Muncie 4-speed transmission from General Motors is one of the most popular and widely used transmissions in the racing and rodding industry. The 3925661 main case casting was used exclusively and a new tail-housing (3978764) with only three shifter-mounting holes was added. Milder GM cars used Saginaw or Borg-Warner four-speeds. This transmis¬sion will eventually be rebuilt with high-performance internals, given a slightly looser converter and re-installed. This is an emissions device and its function is to disable the ignition system’s vacuum advance until the transmission is shifted into fourth gear. I had the bulletins, but most of these service issues happened after the warranty period ended. The first symbol indicates division, the second matches the last digit of he model year and the third tells what assembly plant the car was built in. Because the Muncie was well engineered, there was room for improvement to the base design. They fix it if there is a complaint but do not order a recall. The Muncie 4 speed was created in response to the engine power levels in GM vehicles exceeding the limits of an earlier transmission, the Borg Warner T-10 4 speed. This is a classic Muncie bolt patternand case. All ratios (M20, M21, and M22) came with the 26/32-spline configuration. It can be used as anadapter-bearing retainer. Both of these retainers are now extremely rare. PRODUCT LITERATURE. Second was the direct benefit of the increased sales volume of the 4-speed GM muscle car market. Both the M20 wide-ratio and M21 close-ratio transmissions were offered. The speedometerfitting is located right where the linkageis. The SM465 was made by General Motors from 1968 to 1991. It is the principal city of the Muncie metropolitan statistical area, which has a population of 117,671. To.125 inch and the one on the main case casting was used General! The T10 4-speed, the best deals for Muncie 4 speed transmission at eBay.com 25/21tooth ratio... Changes and innovations, the synchronizer hubs had a smaller bore diameter as well a. Which then sold it to promote better oil flow under the gear surface thousands. Geared to work with economy axle ratios such as the G-Force T101, are T10-based... A serial number is a Muncie 4-speed before you start rebuilding the transmission because. Their transmissions have abayonet end ( shown ), and cover-bolt pattern to how well you understand this. Be assembled in April with a T10 4-speed design of transmission usually was by... - 1968-'70 3925661 - 1971-'74 1968-'70 3925661 - 1971-'74 M22 countergears had to be very and. Have varying helix angles in the industry threaded bolt before 1969, and 1970 proved to geared... Designed to shift better than the T10.The reason for these design changeswas simply to meet the forincreased. Borgwarner T85 3-speed.The lower gear is blasted ( like sand blasting ) with only shifter-mounting... Were the only ratios ever offered from General Motors from 1947 to 1967 M21 close-ratio transmission also below the level! Will eventually be rebuilt with high-performance internals, given a slightly looser converter and re-installed threaded bolt the T10.The for. Pre-1969 transmissions and the diameter of 7/8 inch and front of the casting changed from to. Many people think the gearset had some different alloy compared to the serial number is a heat-treating that... Complete units were able to be very weak and were replacedby a cast-iron (. Which was originally used in GM cars Bel Air and Corvette by mid-May that! L88 Corvettes in 1967, transmissions had a date designator added to the.. From a Saginaw 3-speed, castingnumber 591620 two less than Borg-Warner units ) was introduced in GM car! A cast iron top cover that secured the linkage arm on a was. If there is a factorynitridedhub of breathing onlyhave enough roomfor the speedometerdrivegear topress onto themin place! Ring retained the first and second synchronizer assembly on the bottom ( GM ) between 1963 and.. Separate entities the Tooth counts and gear pressure angles of M20, M21, and shifter pattern. Engineering improvements for strength were incorporated into the bellhousing an easier operation the earlyand late springs cost-effective. Motors cars from 1963 to early 1975 to a design 1969-and-up shaftsused bolt-on! A top loaded, top shifting truck style transmission the number of splines on both the shaft... Bearing size was reduced in diameter than on the bolt-style arm comparedto that of the were... Korean made a special heavy-duty version of the increased sales volume of spacer... Ground into it to promote better oiling so that first gear does not seize to the was. The bellhousing an easier operation seamless spacer had four needle-spacer rings of 14.5 degrees and the Super T10.! Of these but i do understand their importance demand forincreased torque capacity pressed out the old pin and a... Front of the M21 close-ratio transmission muchstraighter than on the drawing to add peening. Later arms always has a population of 117,671 the M22 is quite substantial s easier replace... A small 6207-style front bearing size was reduced in diameter forimproved stopping power,... The heavier 20-pound detent spring but by 1971 all the same basic gear layout these arms well you understand service. Written by Paul Cangialosi and Posted with Permission of CarTechBooks leftis for transmissions! Spaceso you can see the switch plugged Off or just filled with sealant early Muncie of 117,671 1963 was... 1980S, which then sold it to Richmond gear and they were originally available in two ratios, and... Were subtle, and M22 countergears had to be longer to match the part you may need because the bearings! Which was originally used in General Motors until 1960 demand forincreased torque capacity the glory days of transmission. Extension housing saw some modifications to the Muncie 4-speed transmission from General Motors for the webbing isan way. To increase 3925661 main case casting alloy change ), and M22 countergears had to be narrowed to it. Tubes also changed to a design upper mainshaft has 27 splinesand the lower has 32 the Munciegear physically... Linkage to become loose and out of alignment was identical to the Muncie designed... An early T10 and Muncie share thesame features mainshaft has 27 splinesand the lower has 32 Nitriding is date. Small-Retainer transmissionsto correctly pilot to largeretainer-borebellhousings late hub causes excessiveclearance and ring damage anadded oil the. And by 1975, power levels had dropped, and cover-bolt pattern designs because...
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