The Steeda Spherical Upper Control Arm bushings replace the factory-style rubber bushings that are pressed into the axle housing above the rear differential, where the upper control arms attach. These spherical bearings eliminate flex in the rear suspension, and help control lateral axle movement better than rubber style bushings.
With the use of these bearings, along with spherical or rod end style joints at the other control arm locations, a panhard bar is no longer necessary to control the axle laterally. Additionally, these bearings play a significant role in reducing or eliminating wheel hop, particularly on higher horsepower and high-grip setups.
Despite common internet misconceptions, our research has determined that these spherical upper axle bushings still allow ample axle articulation with no binding and are the same parts we use on our Coyote-swapped SN95 drift car.
Note: we recommend not using a panhard bar with these parts, as suspension bind may be induced.