I am getting ready to install a cut and shortened 8 3/4 Chrysler shur lock rear in my 36 truck. will run four bar system with Coil overs.To do so I need to narrow the back half of the frame. I have several ideas on what to do but I am looking for someone who has already done this or something similar. I will run a shortened bed and full fenders and running boards with a channelled body. I haven't seen any one do this so I am on new ground and just looking for some good advice. I was thinking of using a 2X6 .187 piece of tubing to install from one frame rail to the other right at the place where the frame gets cut and shortened. I will cut holes for drive shaft and mufflers and what ever else. Then using the cut frame rails to weld them in board to the 2x6 tubing at 36 inches apart and also do a maybe a 3 " kick up I would alsowill be using boxing plates for the cut rails. Then build a one inch square tubing to mount fenders and bed sides to. Any body have any advice. I am diffenatley this doing so I am looking for good advice.