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Idahome
Joined: Wed May 2nd, 2018
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That is a tough thing to overcome
You would have to start with a blank output shaft and I am pretty sure the number of splines is based on the size of the shaft....so you cannot just grind 32 onto it
https://www.advanceadapters.com/tech-vault/atlas-31-28-34-25-spline-input-ford/
32 splines is a GM thing
https://www.advanceadapters.com/products/atlas-transfer-case-builder-trail-series/
Might consider talking to Advance Adapters and see if you can change parts in the t case side of things
OR
Consider running a GM transmission?!?!?!
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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks