Re: 65 C10 differential swap questions
Lots of good info about axles but another option would be to add an overdrive transmission. For an auto, a 700R4 would work great, a manual a T5 or AX15 swap would be great as well.
Since it sounds like you want a posi and 5 lug axles, the easiest (not cheapest) would be to have a new set of gears, posi unit and 5 lug axles installed into your current housing. This would require zero fab work and most shops who do this work could have it done in a day. If you are not ever looking to install an overdrive transmission, I would recommend 3.08 gears. 3.55 would be perfect with an overdrive.
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