To get 3.08 gears in that '71 12 bolt, you're going to have to change the carrier to a 3 series carrier....no way around it. You could most likely sell the 3.73's and factory posi to offset the cost. You may be able to find a 3 series carrier used as they are the same from '65 to '82 in the 12 bolt truck rear ends. Or as you said go to an OD trans.
Quote:
Originally Posted by Strider
Hey team,
I'm going to take this a little further.
I have a 71 5 lug rear axle that I want to put into my 68c10 ( swapping front drums to discs with a set of cpp spindles).
So I want the front and rear to have the same bolt pattern (obviously!!!!!)
The 71 rear axle is a 12 bolt and the 68 axle is too.
The 71 has 3.73 gears and is a factory posi unit.
I was going to put 3.08 gears in it but it won't accept them according to what I have been told and even summit racing shows in their catalogue that there are 3 different carriers for the chevy 12 bolt truck axle.
I was hoping to go to more friendly highway gears but I can't do this with my 71 axle and my 68 axle has like 4.11 gears.
Any suggestions??????
I didn't want to have to find another axle or buy a carrier to fit. Perhaps I'm going to have to go with a 5 speed with overdrive and dump my powerglide!!!
Riley
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