The Story Of The Muncie 4-Speed Manual Transmission . The M22 Rock Crusher is part of the Muncie 4-speed manual transmissions, which General Motors developed. The name is derived from the Muncie ...
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Information Exchange. Bench Racing. M-22 "rock crusher"
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This makes the M20 much stronger than the Saginaw or T10. The 4-speed Muncie came in three versions. Both the wide-ratio M20 and close-ratio M21 debuted in 1963 in the Corvette. The …
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The 4-speed was the product of careful engineering intended to modernize GM's transmission offerings. ... or Rock Crusher Initially there were two specific Muncie transmissions available: the M20 wide-ratio (2.56:1 first gear) and the M21 close-ratio (2.20:1 first gear). The latter also offered a 1.64 second, 1.28 third, and direct-drive 1.00 ...
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He mentioned he had a M22 rock crusher in his car, and how rare it was because only a few of the M22's were "Rock Crushers". I am by far an expert, but I have never heard of this before. ... Just to add, I don't believe any M22's were ordered in '67 Chevelles, but both M20's (like mine) and M21's were. If you just ordered a 4-speed option ...
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Because M21 is just a code, later Corvettes or other 4-speed cars didn't have Muncies; those equipped with a Super T10 4-speed could have an M21 or an M20 code. Window and tank sticker resources reveal that there was never an M21 option printed on a sticker before 1966, even though many M21s existed I believe the final-drive ratio determined ...
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1972 Muncie M22 Rock Crusher 4 Speed Transmission ORIGINAL C CODE (#267075875534) t***d (1317) - Feedback left by buyer. Past month. Verified purchase. Great seller, great item. Item as described and well packed. ... Muncie 4 Speed M20 M21 and M22 Input Nut Wrench Wt297-w; Manual Transmission Shift Bushing Hurst 3320001;
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Across the top of the page are the words "First Build 4/15/65 – 1st Shipment 4/19/65, recap of M22 (Rock Crusher) Trans." ... All 1963-65 M20 and M21 transmission used a 7/8″ countergear pin in all assemblies. ... On this document the 4 speed transmission option code listed the transmission as an M20.
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Muncie M22 Rock Crusher Second Gear $ 115.00 Add to cart; Muncie 4 Speed O-Ring Speedometer Housing $ 1.00 Add to cart; Muncie M20/M21/M22 Rear Reverse Idler Gear $ 59.00 Add to cart; Technical Resources. Competition Plus Catalog; Installation Instructions for Hurst Shifters; Muncie Identification;
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Get the best deals for Muncie M22 Rock Crusher 4 Speed Transmission at eBay. We have a great online selection at the lowest prices with Fast & Free shipping on many items! ... How To Rebuild Muncie 4-Speed Manual Transmission M20 M21 M22 Rock Crusher. Opens in a new window or tab. Brand New.
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shipped fast, arrived well packaged.
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""You can outfit an M20 or M21 with Rock Crusher type gears, OR actually make a 3 speed O/D out of a 4 speed case. Forth being the overdrive obviously.. Kinda nice if you want the Muncie look and an overdrive"" Actually …
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The M21 is a standard Muncie 4 speed. They both have the same ratios beginning with a 2.20 1st. The M20 is the "wide ratio" version which begins with a 2.52 1st gear. I know that the M20 came in cars with a standard rear axle ration ( 3.31 in my '67 ), while the M21 came in higher (numerical ) rear axle ratios.
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Shop Muncie 4-Speed Speedway Driveshaft Slip Yokes Parts and get Free Shipping on orders over $175 at Speedway Motors. Talk to the experts. Call 800.979.0122, 7am-10pm CST, everyday.
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For example P7C05 will read: Muncie four speed aluminum for passenger car 1976, March, 5th. 1969-1974 codes include a suffix letter at the end to aid in identification of transmission ratios. A = 2.52 1st gear wide ratio M20, B=2.20 1st gear close ratio M21, C …
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9 reviews for Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. Perfect Performance with 2.73 to 3.42 Rear End Gears. 2025 Spring SALE!!! ... NEW Auto Gear Upgraded Ultra Case Muncie Heavy Duty M20 or M21 4-Speed. Camaro, Corvette, Chevelle, Nova. 2025 Spring SALE!!! Rated 5.00 out of 5
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The most popular question has to be that everyone thinks they have the famous "rockcrusher" M22 4 speed. This had the same gear ratios as the M21 but with a heavy duty gearset. The reason you may ask?
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I recently bought a 72 convertible. The owner said he used to race it. Unlikely as it seemed, I bought it because it was in very nice shape. Upon getting into the restoration I noticed he had an M21 bellhousing attached to a muncie 4 speed. i called him and asked him if he knew what kind of Muncie it was, he steadfastly said it was an M22 Rock Crusher.
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It tells how to pick out what is what but the main thing to look for in a M-22 is the gear angle. Take off the side cover and look at the angle of the gears. M-20, m-21 will have 45 degrees gears and the m-22 is 22.5 degrees. They used this to reduce friction and in turn gave it a nice greary noise thus the rock crusher. Chris
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GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. The M22 Rock Crusher …
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GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s.
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The 2.20:1 ratio first gear is usually referred to as the Muncie M21 transmission; based on GM's production codes. The 2.56:1 ratio is referred to as the M20. Muncie also had a second close-ratio transmission coded M22 and …
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Be the first to review "Muncie M22 Rock Crusher Input 26 Spline ... Related products. Muncie 4 Speed Nylon Driven Gear $ 13.00 – $ 15.00 Select options This product has multiple variants. The options may be chosen on the product page Muncie M20/M21/M22 Reverse Gear $ 69.00 Add to cart; Muncie M20 Wide Ratio Third Gear $ 118.00 Add to cart ...
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The M-21 is the close ratio 4-speed. It was used on high performance models with numerically high rear end ratios. The M-22 was the "rock crusher". It had the same gear ratios as the M-21. The VIN is stamped on the tranny. The location may have varied. I haven't looked at mine in a while, so maybe someone else could be more specific.
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The famous "rockcrusher" M22 4 speed had the same gear ratios as the M21 but with a heavy duty gearset. Although the gears are not spur gears ( completely straight ) they still produced a fair amount of gear noise thus the …
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I ended up going from a 4:56 rear gear to a 3:55 gear because of the 3.39 1st in the Richmond. I had talll tires and because of the height of the 33" pro street tires, the deep first gear was similar to having a 4:88 rear gear in first and a 3:23 rear gear in 5th. I think I paid 1699 for the Richmond and another 300 for a Hurst 5 speed shifter.
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If you've ever driven a classic muscle car equipped with a four-speed manual transmission, you probably experienced the joys of commanding a Muncie Rock Crusher. Some classic 1960s General Motors ...
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The wide ratio M20 might make a better swap than the close ratio M21/22 unless you have a 4-something rear gear in it now. If that's the case (low rear gears) you might consider a manual w/OD. ... M-22 Rock Crusher 4-speed $2,150.00 M-20 or M-21 4-speed $1500.00
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A great Super Heavy Duty 4-speed for your Camaro, Nova, Chevelle, Corvette or other GM car. Close Ratio = 2.20-1st, 1.64-2nd, 1.28-3rd, 4th direct. Wide …
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C3 General - M22 Rock Crusher - Just bought a 1968 (originally was 427/435..currently has a CE replacement block from 69)) and I believe it has a M22 vice M21. Intent at some point in the near future is to crawl under and check numbers/code. I know it has the factory 411 rear end (Code FB) so that is the first reason...
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Forged Brass blocker rings. Main drive oil seal input shaft and bearing retainer. 34 tooth 1st super strong 1st gear (stronger that the M22 1st gear). C355 Forged Aluminum mid plate. Lightened main shaft for less rotating mass. The M23 is the strongest Muncie style 4-speed available. Lead time 4-6 weeks. 30% Fee on Cancellation of order after ...
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NEW, Complete 67 - 68 Camaro Muncie 4 Speed Conversion Kit now available! This kit will get you everything needed to convert a automatic 1969 Camaro into a four speed machine! ... M21 or M22 Rock Crusher transmission. With this new kit you also get all the hardware needed to get the job done right the first time. Correct bolts will include head ...
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Muncie Close Ratio - M-22 Rock Crusher Four Speed Transmission - ALL NEW GEARS. Opens in a new window or tab. Remanufactured. 5.0 out of 5 stars. ... 1968 - 1974 Muncie M21 4 Speed Transmission Close Ratio (CHOOSE DATE/ VIN STAMP) Opens in a new window or tab. Remanufactured.
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Was wondering how difficult would it be to replace the old 3 speed manual trans for a m21 or m22 To go behind a 350? WHich trans would be better the m21 or m22 THANX jason 10-14-2011, 08:16 PM #2 ... NEW Auto Gear Super Case Muncie M22 Rock-Crusher, Street/Strip 4 …
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