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Old 03-04-2015, 01:50 AM   #3
Captainfab
60-66 Nut

 
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,254
Re: 65 C10 differential swap questions

Welcome to the forum

That is correct. The '71 and '72 12 bolt will be the only direct bolt in differential to your truck that will have the 5 x 5" wheel stud pattern. But the odds of finding one with the gear ratio you want and a posi is going to be very difficult and $$$$$ when you do. The '73 and up will require cutting and welding to install.

Of course you could always install different gears and the conversion axles in your current 12 bolt. A taller tire will help lower the rpm's with your current gear ratio. Have you considered an OD trans?
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