The Muncie 4 speed was a transmission that was used in General Motors (GM) between 1963 and 1975. 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.
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The 1971 transmissions were the same as from previous year, except that the M-21 close-ratio 4-speed transmission was replaced with a stronger version of the Muncie close-ratio gearbox the famous M-22 “Rock Crusher” 4-speed. It was the strongest 4-speed manual ever installed in a GTO. This lineup remained unchanged in 1972.
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The term "rock crusher" refers to the noise made by the meshing of the stronger helical gears in the M22. Later model 1971-''74 Muncies are also popular with racers, because these transmissions used a 32-spline output that is stronger than the early 27-spline, and the newer units seem to perform better in high-rpm and high-horsepower applications.
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GTO 3-Speed Transmission, 1972 GTO, Heavy Duty 3-speed transmission, Dearborn, Muncie, M13, M12, Muncie M20, M22 rock crusher, Auto Round-Up MagazineA: L.C., thanks for the nice words. The transmission listed on the build sheet you sent me is indeed the Heavy Duty 3-speed transmission I spoke of in the a recent Auto Roundup/Car Collector Corner
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The M22 transmission has a 20 degree helix angle on the gear set as opposed to a 45 degree angle found on the M20 and M21 and were made with a higher nickel alloy. The straighter angle was designed to produce less end loading of the gear train and less heat but created more noise, thus the nickname "Rock Crusher" was born.
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How to rebuild a muncie four speed transmission rock the rock crusher giving a worn out muncie four speed transmission a quick rebuild with parts from summit racing. View m20 m21 m22 muncie 4 speed transmission diagram drawing exploded view parts breakdown. For some reason when it comes to rebuilding a manual transmission the concept of a
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How to rebuild a muncie four speed transmission rock the rock crusher giving a worn out muncie four speed transmission a quick rebuild with parts from summit racing. 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.
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How to rebuild a muncie four speed transmission rock the rock crusher giving a worn out muncie four speed transmission a quick rebuild with parts from summit racing. Muncie 4 speed transmission diagram. The muncie 4 speed transmission from general motors is one of the most popular and widely used transmissions in the racing and rodding industry.
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Pro Comp (VW Type 1 Swing or IRS) The Pro Comp transmission is built for any street, strip and off-road car that has a close 3rd and 4th. Whether you’re a weekend racer or just playing around in the sand, you can pick up a lot of reliability and piece of mind by including a performance transmission for your buggy or sandrail.
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The M22 transmission has a 20 degree helix angle on the gear set as opposed to a 45 degree angle found on the M20 and M21 and were made with a higher nickel alloy. The straighter angle was designed to produce less end loading of the gear train and less heat but created more noise, thus the nickname "Rock Crusher" was born.
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M-22 “Rock Crusher” Identification. The M-22 close-ratio transmission is easily identified internally from the M-20 and M-21 versions by the angle of the gear teeth. The M-22 was only produced in a close-ratio version, so it will not appear on models with high rear-axle ratios (3.55 or lower numerically) unless someone has changed it.
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The 1971 transmissions were the same as from previous year, except that the M-21 close-ratio 4-speed transmission was replaced with a stronger version of the Muncie close-ratio gearbox the famous M-22 “Rock Crusher” 4-speed. It was the strongest 4-speed manual ever installed in a GTO. This lineup remained unchanged in 1972.
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39 Item Part No. Image 1 DE1007 2 DE6000 3 DE6004 4 DE6015 5 DE6006 DE5024 6 DE6007 7 DE0027 tagout)
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Performance Built Muncie M22 Rock Crusher 4 Speed Transmission. This unit has been rebuilt at our state of the art facility. We have carefully engineered a process that allows us to bring you a product we can stand behind. This is a direct replacement for the following Chevrolet ,Oldsmobile, Buick, and Pontiac vehicles. Compatible Vehicles.
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How to rebuild a muncie four speed transmission rock the rock crusher giving a worn out muncie four speed transmission a quick rebuild with parts from summit racing. 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.
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Muncie 4 speed transmission diagram. Steve baur oct 7 2014. Muncie 4 speed casting numbers. Right hand as req. 4 1964 74 186678 186678 lockplate. How to rebuild a muncie four speed transmission rock the rock crusher giving a worn out muncie four speed transmission a quick rebuild with parts from summit racing. 38 16 x 1 hhcs req.
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The M22 is a strong and reliable gearbox. Produced in low volume from 1968 to 1971, the M22 earned the nickname “Rock Crusher” because its straight-cut gears made a distinctive noise while driving. It was designed for maximum performance and could usually be found installed behind L88s and other high-torque big-block engines.
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Chevy Transmissions: Muncie M22 “Rock Crusher 4 Speeds were made From 1965 TO 1974: The most popular transmission of it’s time for high performance cars built for Chevrolet and all performance oriented G.M cars. They have the same gear ratios as the legendary M21 but with a heavy duty gearset.
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3 Muncie 4 speeds were offered. The M-20 wide ratio, the M-21 close ratio, and the "Extra heavy duty close ratio" M-22, also known as the "Rock Crusher". The M-22 was generally installed behind severely powerful (high torque) big-block engines. The M-22 is distinguished from an M-21 by the angle of the gear teeth. The M-22 has "straight cut" gears.
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Most transmissions are missing these tags, but if you want to do a complete restoration they are generally necessary. Even if your Muncie is assembled from a mix of parts, you should be able to determine the ratio. Remember, if the transmission is still in the car only the 1969 to 1974 cases had ratio identifiers in the serial number.
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The M20 and M21 used a gearset with a more angled tooth design on each gear (left). The M22 Rock Crusher used a gearset that features less of an angled-tooth gearing (right). Images courtesy chevelles.com. The gear ratio of the Chevy four-speed transmission placed in any car was usually determined by the engine size and rearend axle ratio.
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M-21 close ratio, and the extra heavy duty close ratio" M-22, also known as the "Rock Crusher". The M-22 was generally installed behind severely powerful (high torque) big-block engines. The M-22 is distinguished from an M-21 by the angle of the gear teeth. The M-22 has "straight cut" gears. This make the transmission tend to be noiser (whines
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Muncie 4 speed transmission diagram. Steve baur oct 7 2014. Muncie 4 speed casting numbers. Right hand as req. 4 1964 74 186678 186678 lockplate. How to rebuild a muncie four speed transmission rock the rock crusher giving a worn out muncie four speed transmission a quick rebuild with parts from summit racing. 38 16 x 1 hhcs req.
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Muncie M22 "Rock Crusher 4 SPEEDS FROM 1965 TO 1974: This page is devoted to OEM Complete units; New aftermarket units and OEM parts and NOS parts. We have rebuild kits in stock and ready for shipment. Email us with your requirements and we will assist you in completing your M22 rebuild or providing you with a complete trans.
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The M20 and M21 used a gearset with a more angled tooth design on each gear (left). The M22 Rock Crusher used a gearset that features less of an angled-tooth gearing (right). Images courtesy chevelles.com. The gear ratio of the Chevy four-speed transmission placed in any car was usually determined by the engine size and rearend axle ratio.
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How to rebuild a muncie four speed transmission rock the rock crusher giving a worn out muncie four speed transmission a quick rebuild with parts from summit racing. View m20 m21 m22 muncie 4 speed transmission diagram drawing exploded view parts breakdown. For some reason when it comes to rebuilding a manual transmission the concept of a
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A video with better audio of the nostalgic sound of a Muncie M22 (Rock Crusher) transmission at work in a 1966 Chevrolet Chevelle.
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