Who made the 4x4 drive line, Marmon-Harrington or NAPCO? Is anything broken in the 4x4 driveline, parts may be made of unobtainum.
As soon as you pull the axles, transfer case, linkage and cross member it will be basically be scrap, as it will be very hard and expensive to move what's left.
Check the rear brake sizes...the GMC could be 15 x 4 while the Chevy is 16.5 x 5.5.
What are the gear ratios of both trucks? You could be going from slow to slower...
The GMC will have a 15,000# Corporate rear and the Chevy will have a 18,000# Eaton rear.
The GMC engine should be a 270...
Mike B
