1971 Jimmy 4wd Project

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I recently picked this up with a knocking engine, so I picked up an 89 2500 suburban and plan to swap the entire drivetrain into this (Engine/trans/trasnfer case, front and rear axles). From what I have read, the leaf purches are 2" wider on the newer axles ? If anyone out there has done this already, and can point out the best way to do the swap, I would apprectiate it.

Pics of the Jimmy, and Suburban attached.