It appears that what happens with these is that the members (18, 19) twist, then the aluminum torque rods (31,34) pretzel.
Stock configuration
Some have boxed the subframe sections entirely, or bridge the L&R subframe sections in part or with solid panels. Since I have spare sets of these, I’m going to double the L & R sections. I started on it today. I’m also thinking of adding additional bushings on either side at the rear
Driver’s side mostly done here. I’m leaving the addition of a second pair of rear upper bushings until I can be sure there is nothing to interfere.
Haven’t seam welded the sections, not sure I will need to. Not .16″ – 105″
Spacers inside the welded sections at the mount points to prevent compression
Looking at this, I can add a weld to the sleeves inside here for additional strength.
Found longer bolts for the torque mounts & forward pin
These exhaust hanger studs have to be extended to pass through the revised thickness. Don’t need spacers here, there’s no compression happening.
4 spacers cut for right side pair
These main spacers are to be welded in place on the inner section before sandwiching
These I drilled out the holes, and am welding them on either side
right side prepped for welding
As you can see the sections are not entirely uniform in fit, I carefully pulled the two sections together & tacked on the left side, being certain to make sure there was no distortion or twisting that would impact the spacing of the mount pins at the bushing. I’ll do the same for the right pair
I’m going to add 3-4 cross braces to tie them together, at regular intervals
Additional rear upper supports would be along these lines, they will be boxed
I have angle iron in the same wall thickness to use for joiners
There appears to be plenty of room up there, based on this pic from another T’Bricker