A 3.73 gear was standard in 1969 Z28s, 100s of thousands of pick up trucks have been built with 3.73s, We just sold a 84 Monte Carlo SS with factory 3.73s, and have a 78 Z28 with factory 3.73s. None of these cars had overdrive. If it was OK for the General, it is OK for you.
She is going to turn 3200 or so at 70MPH, no big deal
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Frank Serafine
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