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4 Speed Muncie M22

Contrary to popular belief, you cannot tell a 4-speed muncie is an m22 by looking at the input shaft splines. all m22s use a 26-spline shaft made from a stronger alloy than the other 4-speeds. however, gm made both 10- and 26-spline versions of the m20 and m21. there are two ways you can tell the difference between the m21 and the rock crusher.

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