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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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I have heard that the m22 "rock crusher" is the best tranny for high horsepower applications. What about the m21? How reliable is a rebuilt m21 in mid to high horsepower applications?
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Typically, the M20/M21 gearsets have a first-gear helix angle of 26.4 degrees and an input shaft angle of 39 degrees. The reduction in the angle with the M22 is quite substantial. The M22 first gear has an angle of 14.5 degrees and the …
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New Super Heavy Duty Direct Replacement Heavy Duty M20 or M21 With Muncie Auto Gear Upgraded Ultra Case. Close Ratio or Wide Ratio Gears. 10 OR 26 spline input and large 27 OR 32 spline output shaft. ... Super Pro Road/Race Muncie Upgraded Ultra Case M22 Rock-Crusher. 2025 Spring SALE!!! Rated 5.00 out of 5 $ 4,199.00 Original price was ...
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The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and …
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A friend of mine is restoring his 70 SS Camero and found a M22 rock crusher cheap,, it needs work but I have seen certain M22's going for big money on the net and was wondering were and how to read the date code on case,, are certain year M22's worth more then others? ... 70 Chevelle L78/M21 10 Avalanche LT 1500 4wd 06 Equinox. Save Share
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the old "Rock Crusher" was a "close ratio trans, the same as the M21... the new "wide" in a widfe ratio, similar to the M20 (ratio-wise)... Both version will have similar RPM drops between 1st-2nd and 2nd-3rd, but the wide ratio will have a bigger drop between 3rd-4th, hence the "wide ratio" name...
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The M22 was eventually dubbed the "Rock Crusher". It is a common misconception that all Muncie transmissions are "Rock Crushers", but it is only the M22 that deserves that name. The M20 and M21 were both release in …
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However, the Rock Crusher was only equipped in cars that had high-performance big blocks, including the Corvette, Camaro, Firebird and Chevelle. Thanks to the similarities between the M20, M21 and M22 transmissions, you can use a combination of Muncie 4-speed transmission parts to build the transmission you want for your project car.
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Muncie Gasket Set M20 M21 M22 1963 -1974. Complete Muncie gasket set for all Muncie transmissions. From $19.95 . ... The Rock Crusher earned its name from the audible noise it produced, resembling the crushing of rocks, and it quickly gained popularity among drag racers and street racers alike. ...
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The Muncie M22 is known as the Rock Crusher. See how we improve its strength and versatility by adding a Gear Vendors Overdrive. ... the close-ratio M21, and the heavy-duty M22 close-ratio ...
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The most well known Muncie transmissions are the M20(wide ratio), M21(close ratio), and the M22(rock crusher). Although not mentioned much, there was also an M23 transmission that was used, beginning in 1970. The M23 is recognized by a 26-spline(fine) input shaft and a large output shaft that requires a T-400 driveshaft yoke.
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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 known as the "rock crusher," which was used behind performance big-block engines and in some Corvettes. These M22 units are ...
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5 speed will give you the best of both worlds. I proved it to myself that the close ratio m21 or m22 is 2/10ths and 3mph difference. You want the 2.56 first gear, I have the m22 wide ratio maserio gears with a 4.30 in the vette and a m20 with 4.10's in the Camaro, make sure you bush the case and use A steel mid plate.
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Muncie M22 Aluminum "Rock Crusher" Transmission (Fits M20 and M21 and will match your 10 spline clutch plate and 27 spline drive shaft yoke and will accomodate your existing shifter) Paypal. We accept Personal Checks (product ships after personal check clears), Money Orders, Cashier Checks (Bank Checks) and all major credit cards, including ...
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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? Well it wasn't designed so that …
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Muncie four-speeds were produced in two different ratios: the wide ratio (M20) and the close-ratio (M21). There also was a second, heavy-duty close-ratio version: the "Rock Crusher" (M22) that was ...
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Muncie M21 4 Speed Transmission Rock Crusher Close Ratio 2.20 3925661. schiadarivertunnel (4533) positive; Seller's other items Seller's other items; Contact seller; US $800.00. 0 bids. Ends in 6d 21h. US $2,000.00. Buy It Now. No Interest if paid in full in 6 mo on $99+ with PayPal Credit * Condition:
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Wide, Close, 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, …
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The M20 / M21 transmissions when in good condition are a fairly quiet transmission. If you want to know what a M22 sounds like get the movie 2 lane blacktop. ... Thats what puzzels me if I really do have a Rock Crusher. Save Share Reply Quote Like. K. k-star. 3072 posts · Joined 2004 Add to quote; Only show this user ...
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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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The M22 'Rock Crusher' featured a one-inch countershaft pin bore and shot-peened gears with aggressive helix angles that reduced heat and stress but also increased noise, leading to the nickname as the transmissions rattled …
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Information Exchange. Bench Racing. M-22 "rock crusher"
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M21's are inherently weak, but the M22 aka ( rock crusher ) is the beefed up version of a close ratio m21, the M22's were designed to handle the higher torque and HP of GM's big block engines produced through the mid to late sixties, the super T10 was produced from 74 to 82, they have a 21 spline input shaft, hardened gears and a hardened cases ...
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You have a choice of a original completely rebuilt GM Muncie M20, 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 markings like original. The transmission is professionally rebuilt and guaranteed for 1 year.
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You have a choice of a original completely rebuilt GM Muncie M20, 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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Although some claim that the M23 is a 'rock crusher', it is indicated that this box was assembled in both wide and close ratio components and also with straight cut gears common to the rock crusher (M22) transmission. Looks like you have a second design-feb. 28th, 1968, M20 or M21. Definitely not a rock crusher(no straight cut gears).
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M21: Close ratio, for high performance. M22: Known as the "Rock Crusher", designed for high-torque applications. Using these tips, you can confirm whether you have the right transmission for your Chevy and make informed decisions about any potential restorations or modifications. Feel free to share your findings or ask if you have questions ...
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I have a suspicion that rock crusher may have first been used in a late-1960s auto magazine test drive, but was hoping the historians in this group might be able to narrow it down. ... 1966 Chevelle SS 396/360 M21 3:73 posi. silver/blue buckets Extraordinary claims require extraordinary evidence.
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The dead 2.20 first gear ratio which is the same in the M21 is not that good for off the line acceleration. You would need at least a 4.56 rear end gear to compensate for the dead first gear. That was OK when gas was cheap in 1967 and you did not mind pulling 3000 RPM at 50 MPH while going to work. Times and requirements have changed making ...
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