Also started to assemble the Reilly Motor Sports "Street-Lynx" 4 bar rear suspension.
The first step is to weld the upper support bar to the frame rails. Due to production line tolerances, sometimes the upper support fits tight to the frame rails and other times there is a gap. I had a 1/8" gap. The instructions specify welding a plate onto the frame rails and then weld the support bar in place.
