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Re: Advice needed 69’ c10 frame off resto. Rear end
12-bolt is the best axle and 3.73 is a good all-around gear set. Whether it's an open diff or limited slip is hard to confirm without pulling the cover. If it's an open diff, upgrading to limited slip isn't too hard but does take a few specialty tools and time.
As far as conversion to disc brakes, I'm glad I upgraded. Not a big stopping power increase because the front does most of the work, but disc brakes look so much nicer and are easier to service. I got my kit from Little Shop Mfg.
At the very least, you should rebuild brakes and replace axle bearings and seals and diff cover gasket and fluid.
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