Muncie 4 speed
Muncie 4 speed. 3925660 casting number. I was told it is a M21, but can not verify it by looking at the transmission. It was modified by previous owner who was going to use it in a road race car. They welded a piece of aluminum plate to the top to prevent the case from flexing. There is a slight twist in the output shaft splines, but I was told it did not cause any issue. $800 OBO.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4.
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