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Re: Can a 98 1500 rear axle work on a 63 3/4 ton?
The '88-'98 rear differentials measure 64-3/4" WMS to WMS. I don't remember the exact measurement on your original C20 rear differential, but it is somewhere close to that. That said, the '63 to early '70 C10 differentials measure 62" WMS to WMS. Then the late '70 to '87 C10 differentials measure 63-1/2" WMS to WMS. So the '88-'98 is a bit wider than a C10 differential in your truck. It may work if you are OK with running wheels with a deep backspacing. Personally I would look for a '71-'87 rear differential.
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