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Thank you Jim for the response. I have been crunching my numbers and had a few more questions. You said the 8.25 gear ratios are limited to 3.42 and 3.64. If I put the 3.42 with a TH350 I already have how would the RPMs be at highway speeds? Do you think I could live with them. There is a possibilit...

Hello all I've recently been wanting to change my 70 Buick skylark from a peg leg to a posi unit. I have done a lot of research so I'm trying to narrow down the right fit for me. The engine is stock. Might do some mild upgrades in the future but nothing to wild. Has a TH350, but will probably change...