what is a wonder bar??????

 

It is a Steering Brace that was installed by GM on 1985-90 IROCS with the 16" rims. It mounts between the front sway bar bushing retainer brackets and the frame. The Steering Brace (also known as the Wonderbar) performs two functions. First, it ties the left and right sides of the frame together under the front of the car, which maintains the correct geometry of the pitman arm and idler arm during cornering. You can think of it as a Strut Tower Brace (STB) for the bottom of the car. It actually improves the handling of the car more than a STB does. Second, the Steering Brace strengthens the chassis and takes stress of of the steering gear box mount. It is common in ThirdGen F-Bodies for fatigue and stress cracks to form around the steering gear box mounting location.

Lon