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
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identifying the muncie. there also was a second, heavy-duty close-ratio version: the “rock crusher” (m22) that was offered on some of the high-performance big-block models, starting with
learn how to identify production code numbers, vin numbers, and more on a muncie transmission. and a second heavy-duty close-ratio m22, also known as the “rock crusher. and m22 four
an m-22 "rock crusher" is a muncie four-speed transmission for cars made by general motors in the 1960s. identify a transmission type correctly before fitting it into your car. if you have the incorrect transmission, your car may not function properly. you can identify several unique signs that identify an
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).