Aluminum diagonal brace

[78F350]

Originally Posted by DWBOX2000

My mechanic recommended putting a ratchet stap on the two wheels and pulling them together. Do I put the strap through the rims and torque away? How much can I torque? Suggestions?

Your mechanic may be the best one to ask. I'd say, Just enough to move it unless it doesn't move with 'moderate' force.
Looking at the rear frame structure, the lower end of the 'side section bracket' is the part that you are going to be moving. The front part of it is bolted to the crossmember and will not move much. The aft lower part of the bracket is most likely the part that needs to be adjusted and it should move without a lot of force. With the diagonal brace and sheet metal plate off, the only thing providing stiffness to it is the connection to the stabilizer bar (through a rubber bushing).