I may invest in an Autogear M23 eventually. My car is in the 3800-4000lb range, add in close to 500 ft/lbs of TQ... I see the potential to destroy the mint M21 in my car.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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