This should be one of the first things you do. It ties the body together. Sooner or later, the center of the car will start sagging. Also, it helps handling. I would do this before the bar. This way you know the frame is straight and level and then bolt in the bar. Mine bolted in right behind the front seat and the back was bolted close to the shock tower.
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more!