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Old 12-06-2012, 10:40 AM
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My '65 had 3.73 ratio in the 12bolt 8.875.. Inline 6, Muncie SM318 trans..

Maybe yours was changed somewhere along the line.

Easy to figure, count ring gear and divide by pinion. Common ratio numbers in these are 3.08, 3.42, 3.73, 4.10, 4.56..

With a .70 OD, a TH700 would be nice with a 4.10. Much more than this, first gear (3.06) would be about useless..(IMO)
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