UMI Performance 4017-R Rear Upper Control Arms with On-Car Adjustability

The UMI Performance 4017-R rear upper control arms deliver professional-grade suspension adjustability for GM vehicles. Engineered with on-car adjustability, these control arms allow you to fine-tune pinion angle settings without removing the arms—simply loosen two jam nuts and turn the adjuster to quickly lengthen or shorten the arm length in your garage or at the track.

Premium Construction:

• Aircraft-quality 4140 chrome-moly threaded tube adapters for maximum strength
• Heat-treated 4140 chrome-moly solid adjusters (1.000" diameter)
• Hard chrome plated Teflon/Kevlar self-lubricating spherical rod ends for bind-free operation
• CNC machined 6061 aluminum step bushings at mounting points
• Precision TIG welded construction throughout
• Durable powder coat finish for long-lasting corrosion resistance

Performance Benefits:

• Improve 60-foot times with precise pinion angle adjustments
• Increase traction and reduce wheel hop
• Ideal for drag racing, autocross, and street performance applications
• Eliminates bind associated with stock rubber bushings

UMI's Ultimate Arms feature no compromises in materials or manufacturing. Where other manufacturers use mild steel, UMI employs 4140 chrome-moly steel in critical stress areas. The combination of precision CNC machining, premium materials, and fully welded construction makes these arms built to handle the most demanding applications.