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I have a Tremec with a .68 overdrive fifth. Originally the rear was a 3:31, and fifth gear was virtually useless unless the speed was 75+ MPH.
I thought about going to a 3:73, but worried that with a first gear ratio of 3:27, first gear would be too short. Eventually I went to a 3:54 rear, and that has been satisfactory, although still not ideal. At least fifth is more useable now, and I can get into fourth around town.
Tremec makes a replacement cog for fifth at .82. That combined with the 3:54 rear might be the best combo. If more punch off the line is your goal, then go with the 3:73 and leave fifth alone. just don't be surprised if you have to shift out of first at around 40 MPH. good luck - - Allen
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