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

The UMI Performance 4019-B rear upper control arms deliver professional-grade adjustability and durability for GM vehicles. Engineered with on-car adjustability, these control arms allow you to fine-tune pinion angle settings without removing the arms from the vehicle—perfect for making quick adjustments in the garage or at the track.

Key Features:

• On-car adjustability for easy pinion angle tuning without disassembly
• 4140 chrome-moly threaded tube adapters for superior strength
• Heat-treated 4140 chrome-moly adjusters with 1.000" solid construction
• Hard chrome plated Teflon/Kevlar self-lubricating QA1 spherical rod ends
• CNC machined 6061 aluminum step bushings for precise fitment
• CNC machined 0.250" mild steel mounting points with TIG welded construction
• Durable powder coat finish for long-lasting corrosion resistance

These Ultimate Arms address common weak points found in competitor designs by using aircraft-quality 4140 chromoly steel throughout critical stress areas. The Teflon-lined spherical rod end design ensures bind-free operation, making these arms ideal for drag racing, autocross, and street performance applications. Proper pinion angle adjustment is essential for reducing 60-foot times, increasing traction, and eliminating wheel hop—and UMI's simple two-jam-nut design makes these adjustments quick and repeatable.

Precision CNC machining and fully welded construction ensure these control arms can handle the demands of high-performance driving while maintaining the adjustability needed to dial in your suspension setup perfectly.