Rear control arms are one of the most important suspension  modifications that can be done to your GM vehicle. Stock control arms  are on the borderline of junk, bushing deflection and rusting  weak stamped material add for traction loss and poor handling ability.  Our boxed control arms are designed to give you the best of both  worlds, whether your car is a weekend cruiser or a weekend track addict  we got you covered. The included Energy Suspension polyurethane  bushings are an excellent improvement over OEM rubber bushings, while  adding ride improvements they also work excellent to reduce traction  loss. These control arms are a direct bolt-on replacement designed to  minimize wheel hop, improve cornering and help track consistency. Each  control arm features the correct provisions for adding a stock or  aftermarket sway bar. Sway bar holes are reinforced with a 0.120" wall thickness steel sleeve TIG welded and sanded into place. The  construction of the control arms features 0.120" wall thickness  rectangular tubing with CNC machined drawn over mandrel bushing holders  and MIG welded end caps to keep out unwanted road debris.   Features - Built using 0.120" Wall Thickness Rectangular Mild Steel Tubing - CNC Machined for Precision Tolerances and Accuracy - MIG Welded DOM Steel Bushing Holders  - Grease-able Energy Suspension Bushings with Grease Fittings - Durable Long Lasting Powder Coat finish   Installation: Installs in 1 hours using OEM hardware. All installation instructions included.