I use a 3:73 with my T56. I am very happy with both the performance, and streetability. I am happy with the balance of just enough, but not too much shifting. I don't know if there is any difference in the Z06 6 speed, but I know that the preferred gear among 4th gen F-body guys seems to be a 4:10 ratio. I have driven cars with 4:10's and they are a blast to drive. If your engine is heavily cammed, I would think the deeper gear would be the way to go.
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'96 Z/28 Convert Sorta Pro Touring
1967 Chevelle SS396 Convertible On the way to entry level PT
2013 Ford SVT Raptor Supercab Pro fuel consumer
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