65-70 GM B-Body Rear Lower Control Arm

The 65-70 GM B-Body Rear Lower Control Arm (Part No. 3655-B) is a tubular trailing arm designed for first-generation muscle cars and classic B-body platforms from 1965 through 1970. This component directly impacts rear suspension geometry, wheel alignment, and handling dynamics on vehicles that demand precision suspension tuning for street or track use. The arm features polyurethane bushings and a durable black powder-coat finish engineered to withstand corrosive road salt, temperature cycling, and sustained lateral loads.

Tubular construction reduces unsprung mass compared to OEM stamped steel designs while maintaining torsional rigidity required for consistent suspension behavior under acceleration and braking. Polyurethane bushings offer a balance between compliance and responsiveness—they resist degradation from heat and UV exposure far longer than factory rubber, eliminating the compliance creep that develops in aging suspensions. The black powder coat provides corrosion protection suitable for long-term storage or outdoor storage conditions. At 16.3 lbs, this arm is a direct bolt-in replacement that requires no modification to mounting points on original B-body frame rails.

Buyers restoring or upgrading 1965–1970 GM B-body vehicles—including Chevrolet Chevelle, Pontiac GTO, Oldsmobile Cutlass, and Buick GSX platforms—rely on this control arm to correct worn suspension geometry or transition to modern alignment specifications. Whether supporting a stock rebuild or a restomod platform with upgraded brakes and wheels, this rear lower control arm stabilizes the rear axle housing and prevents bump steer during cornering. This is essential hardware for anyone prioritizing suspension reliability, wheel alignment precision, or improved handling response on classic B-body platforms.