Originally posted by kirby_51:
At the back of the cab or at the tail of the truck?
Welcome to the Stovebolt!
The answer is probably both. You need to shorten the wheelbase, which is a cut between the front axle and the rear, and you probably have too much frame behind the rear axle, requiring it be trimmed too.
There was an article in a magazine a while back describing the complete process. Someone makes a kit to make it easier, but I don't recall which magazine or who makes the kit.