Couple ways to short a big truck.
One, cut the frame, weld and plate. Many ways to do this, but General Motors has a best practices way to do it, and if I was going to do it, I would do it that way. It's a free download. If you can't find it, I can.
Two, cut, pound or drill out the rivets in your rear suspension and move it forward. Easy with a straight frame, not so with a tapered frame, but can be done. This is the strongest and straightest if you drill the holes correctly. Good bolts, and ream to fit.
Both ways, obviously, you will need to shorten your driveshaft. I would have someone do that and get it balanced. Not sure I want to be chasing a vibration problem in the future.
I am going to move the axle forward on my 65 GMC 5000 a couple feet this fall, but I am going to replace the leaf springs with a air set-up from a IH truck. Keeping my axle and hyd brakes so everything works the same. Just adding a electric air pump and tank. Air ride..
Good luck with your project,
BaconFarms
