Originally Posted by silverstangboy
I always understood that a panhard bar was best suited to road track cars, maybe spector could chime in here
Yeah, the panhard helps control the lateral movement of the rear-end. So, it's not very helpful for straight line traction. It does make a big difference in cornering though, because the upper control arms alone are not very effective at controlling this movement. Reason being that with the stock suspension design, the upper control arms are responsible for controlling both the lateral movement of the rear-end as well as rotation or "wind-up" of the rear.
A torque arm, however, controls axle wind-up and helps to eliminate wheel hop. With a panhard and torque arm both, the upper control arms are eliminated entirely. The panhard then is solely responsible for lateral movement, and the torque arm is soley responsible for wind-up.
I suggest you go to Maximum Motorsports :: The Leader In Mustang Performance Suspensions
and read-up on some of the tech info they have for each of the parts. Also note that if you do decide to go with a torque arm and panhard combo, you'll need to make sure that the LCAs you are using do not cause the suspension to bind.