Launching harder, reducing wheel hop, and adding cornering consistency to your 1978-1987 GM G-body is easy with a Rear Suspension Kit from BMR's suspension. Stock stamped steel control arms with soft rubber bushings deflect under load and absorb power instead of transferring it to the tires. BMRs polyurethane, non-adjustable Rear Suspension Kit (RSK469) consists of non-adjustable lower control arms, adjustable upper control arms, and control arm reinforcement braces. The kit is completed with polyurethane differential bushings and hardware for everything. The lower control arms are manufactured from heavy-duty 1.50-inch diameter, 0.120-inch wall, DOM steel tubing, the lower control arms provide all the strength youll need for any performance application. The upper control arms are manufactured from 1.25-inch diameter, 0.120-inch wall, DOM steel tubing, strong enough for any compression load. The center adjuster is CNC-machined from chrome-moly steel with rolled threads for the ultimate in strength and durability. This design gives you a strong control arm that greatly improves performance. The reinforcement braces are made from 1.0-inch diameter, 0.156-inch wall, steel tubing to help reduce frame deflection. The upper and lower control arms come with greasable, 95-durometer polyurethane bushings that add a solid, more responsive feel over the stock rubber bushings. BMRs bushings are internally fluted, which keeps grease in the bushing, even under heavy load.