Cool truck!   What are the plans?

I found someone has already done some bad work on the trucks frame. There is a crack in the frame half between the rear leaf springs. Some had suck coil spring between the frame and leaf spring. I’m guessing they need to haul more then the leaf could hold therefore cracking the frame. I don’t know if it crack all the way. There is a think 5/16” plate on top, bottom and the inside. I will remove this plate once the rear-end is out. Other than that the frame is nice and square!

I don’t like the think steel plate on top and bottom. My thought was to remove the inner and out plates of 5/16” and put back a fish plate on the inside only (see render). I would like some other ideas on this if any has done this before.

My original idea don’t work as planned. The frame was too small to weld around the fish plate. So I went to plan “B”… boxing the frame in. I plan to do this to the other side.

Update... I have finished patching both side of the frame and painted it with Eastwoods rust encapsulator and a top coat of their chassis black. Also replaced seals in the rear-end and painted it the same. Now I’m working on some 1-1/2” lifting blocks. Take a look….

Lookin' good!   It appears you're taking the time to make sure everything is done correctly, and it shows.