59-70 GM B-Body Upper Control Arm Hardware Kit

The UMI Performance 59-70 GM B-Body Upper Control Arm Hardware Kit (part number 3606) is a complete fastener solution for upper control arm installation and maintenance on first and second-generation General Motors B-Body platform vehicles. This hardware kit delivers OEM-specification bolts and lock nuts in a cadmium-plated steel finish, engineered to meet the structural demands of chassis assembly and suspension geometry on classic Chevelle, GTO, Skylark, and Buick platforms.

The kit includes matched pairs of 4.35-inch control arm bolts with 5/8-18 inch threads and 5/8-inch hex heads, paired with corresponding lock nuts to ensure secure, vibration-resistant assembly. Cadmium plating provides corrosion resistance suitable for street-driven classics while maintaining a period-correct finish that blends seamlessly with factory hardware. The 5/8-inch hex head dimensions accommodate standard metric and SAE socket tooling, while the 18-thread-per-inch pitch ensures consistent clamping force across suspension articulation cycles. Proper torque specifications and lock-nut engagement are critical to preventing control arm movement under cornering loads and longitudinal braking forces—this kit provides the verified hardware geometry to maintain OEM alignment specs.

Classic muscle car owners, restoration specialists, and suspension technicians rely on matched OEM-spec hardware to maintain factory suspension geometry during rebuilds or upgrades. The 59-70 B-Body platform represents the golden era of American performance, and correct fastener specification is non-negotiable when restoring these vehicles to roadworthy condition. Whether performing a frame-off restoration, replacing worn suspension components, or upgrading to aftermarket control arms, this UMI kit ensures compatibility with original and modern B-Body upper control arm designs. Weighing 0.98 pounds, the complete kit fits easily into a technician's box for on-site or garage work.