Sliding 2X3 rect tubing into rear frame rail.

Brad4406 said
Mine fit tight around the outside of the rear frame rails and the last owner on my previous car already had it done before I bought it, so I've never seen that issue, but I've never seen someone trying to weld them inside the rear rails either. Why did you decide to do it that way when it is so much easier to slide them around the rear rails and then weld?

I did mine that way because the complete floor was out and I wanted to stub them in on both ends. In the front I went through the torsion crossmember into the front rails, and did a bunch of extra welding throughout the torque box area and bar mounts being it might get an o/d at some point and the hump would get cut and I could fab a mount easily.