The 3.08 will give you plenty of low gear 3.08*3.06(700r4 1st gear)=9.425 final drive ratio whereas on the highway in overdrive you get 3.08*.7(overdrive ratio) =2.16 final drive ratio compared to 7.76 1st gear final drive and a 3.08 final drive ratio for a TH-350. I have to agree with underdog.... sort of. If you are planning on putting some serious hurt on your differential, or are going to be doing a lot of racing, that 10-bolt would not hold up to the pressure without some serious and frankly not worth it mods. A f*%d 8 or 9 inch would be better in that situation, but in a street driven truck, the GM rearends are fine, I am putting a 10-bolt in my 65 right now that i found in an 80 chevrolet truck that has some crazy 2.27 gears in it behind a TH-350.
Last edited by Eric J. Swindle; 04/23/2008 8:38 PM.
