I noticed this too. Perfect arrangement for a coil over conversion, but less than ideal for a leaf spring car that is putting loads in to the rear most part of the sub-frame.

For years I had thought that the roll cage in the `Cuda was built wrong when it came to the rear down tubes. It turns out that my roll cage is built correctly to SCCA specs which is from the main hoop 45° degrees to the wheel wells. I called two SCCA tech inspectors to verify this as well as tubing size specs, etc.

Originally that's how All American Racers built the Trans Am cars were down tubes from the main hoop to rear leaf spring perch. What SCCA rules and engineering requires currently is down tubes from main hoop to go at 45° deg down to the wheel wells. That way in a rear end accident it can crumple the rear of the car without transferring additional force through the down tubes into the main hoop therefore not compromising/kinking the main hoop & halo. I also have a fuel cell cage back there to help absorb any rear impact.

The reason I brought this thread back from the dead is just to clear up some confusion as I will be tig welding in the cage on the 73 Challenger build. Felt dumb for years thinking my cagebuilder installed it incorrectly when he was actually correct haha! I will also add in tubes that tie in the torsion bar crossmember which "mirrors" it inside the passenger compartment as well as a tube the ties both legs of the main hoop together. I'll get video to document and post it up on our YouTube channel next year. Still have to buy all the tube because I'm broke haha!

Not pointing any one person out, just replying to the last post thanks!