I have 3.55s in both my 69 RA V T/A and GTO.That IMO is as low as you would like in a steet car.I drive to a lot of shows that are 30-50 miles away and usually in the slow lane at 2800 RPMs.My 421 lemans has the tremic with 3.90s and is very drivable on the freeways.Tom
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