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Muncie 4 Speed Rock Crusher

Jul 05, 2016 · Identifying The Muncie. 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 offered on some of the high-performance big-block models, starting with the.

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