UMI Performance 4019-R Rear Upper Control Arms with On-Car Adjustability

The UMI Performance 4019-R rear upper control arms deliver professional-grade suspension adjustability for GM vehicles. Designed for both street and track use, these control arms feature on-car adjustability that allows you to fine-tune pinion angle without removing the arms from the vehicle—simply loosen two jam nuts and turn the chromoly adjuster to quickly lengthen or shorten the arm.

Key Features:

• On-Car Adjustability: Make pinion angle adjustments in the garage or at the track for improved traction and reduced wheel hop
• Premium Materials: 4140 chrome-moly threaded tube adapters and heat-treated chromoly adjusters for maximum strength
• QA1 Spherical Rod Ends: Hard chrome plated with Teflon/Kevlar self-lubricating liners for bind-free operation
• Precision Construction: CNC machined components with fully TIG welded 4140 chromoly construction
• Heavy-Duty Mounting: CNC machined 0.250" mild steel mounting points with 1.000" solid heat-treated chromoly adjusters
• CNC Machined Bushings: 6061 aluminum step bushings for precise fitment
• Durable Finish: Long-lasting powder coat finish for corrosion resistance

These ultimate arms eliminate weak points found in other manufacturers' designs by replacing mild steel components with aircraft-quality 4140 chromoly steel throughout critical stress areas. Perfect for drag racing applications where pinion angle adjustments are essential for lowering 60-foot times, or for autocross use where bind-free suspension articulation improves handling performance.