I just re-did the rear suspension on my '68 Firebird this past winter. The car had a set of aftermarket traction bars on it when I started the project, went back to the original set-up from factory and lost no traction from the change. Took car from a 2.56 peg-leg to a 3.55 posi with a M20 Muncie & a healthy 400. Was fun to drive! One thing that did gain was ground clearance. Traction bars hang down alot more than the factory shock plates. Won't have to worry about speed bumps in the mall parking lots! Just my thoughts.
