54 gmc rear box frame??

[troy54gmc]

Hey Guys, well its finnally starting to cool off here in AZ and starting back on the project. After some measuring i noticed that my back half of the original frame is way off to one side. looks like it took a hit in the rear at some point. Im going to use a triangular 4 link and air bags in the rear anyways, so im thinking of just cutting off frame behind the cab and building new box frame myself. Anyone got any pictures of this to go off of ?????????? Thanks...