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Re: Diff help with my 65 C20
The tooth count of both the ring and pinion gears is stamped on the outer edge of the ring gear. Divide those two and that is your ratio. As alread mentioned by 66Submarine, 4.10's are the only better ratio you are going to find.
For what you are describing you are wanting to do, I would also suggest converting to C10 running gear. You can lower a C20, but then you are limited to 8 lug wheels.
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