IMCA Spec GM Metric Stock Car Racing Upper Control Arms, Alum. Cross

• Tubular steel construction with aluminum cross shaft for less weight
• Approximately two pounds lighter per arm than steel cross shaft design
• Fits 78-87 GM Metric chassis configurations for racing use
• IMCA approved and includes approval decals
• Left side control arm maintains stock GM spec 8.5-inch length
• Right side is 8.0-inch length to provide additional negative camber
• Reinforced ball joint mount is designed for K5208-spec metric chassis ball joints
• Sold individually and does not include ball joint or mounting hardware

IMCA Approved Metric Chassis Control Arms with Aluminum Cross Shaft

The factory stamped style front Metric upper control arms do not provide the strength and reinforcement necessary to survive the circle track racing lap after lap. Flexing and cracking are the norm with stock stamped steel Metric upper control arms, which can lead to catastrophic control arm failure and a bad wreck. No one wants that. A much safer and stronger alternative is a steel tubular control arm. The increased strength and rigidity of this style of front upper control arms mean repeatable handling with minimal wear and maintenance. IMCA understands this and is why they allow a tubular control arm as the spec piece in classes such as Stock Car. Now you can replace your aging or worn stamped steel control arms with these stronger IMCA upper control arms for your Metric chassis-based race car.

Made from 1-inch diameter .092-inch wall thickness steel tubing and featuring a reinforced 1/4-inch-thick ball joint mounting plate, these IMCA approved tubular steel front upper control arms include lightweight aluminum cross shafts. These aluminum cross shafts are a metal-on-metal greaseable pivot design and save two pounds of front-end weight per tubular control arm over our standard tubular control arm with steel cross shaft. The cross shaft is designed to mount to GM Metric chassis fitments with 6-7/8-inch mount spacing (or use our weld-on mount plate). We made the left arm standard 8.50-inch in length to maintain the factory suspension geometry, while we shortened the right arm to 8.0 inches to increase negative camber for circle track use. These are often used in conjunction with “tall” ball joints, and these arms use standard Metric arm K5208 ball joints. A steel cross shaft version is also available for those looking for absolute durability and longer service life.