UMI Performance 4037-B Rear Upper Control Arms with Roto-Joints

UMI Performance's 4037-B adjustable rear upper control arms are engineered for serious street and track performance. Designed for muscle cars and pro-touring builds, these heavy-duty control arms feature UMI's proprietary Roto-Joint spherical bearings that virtually eliminate suspension deflection for razor-sharp handling, easy pinion angle adjustment, and reduced wheel hop.

Key Features:

• UMI-designed Roto-Joint spherical bearings for maximum strength and minimal deflection
• On-car adjustability using UMI's proprietary chromoly adjuster—no need to remove arms
• CNC laser-cut 1/4-inch thick upper mounting pads for superior strength
• Chromoly (CrMo) threaded adapters provide improved thread strength and longevity
• Durable powder coat finish resists corrosion and wear
• Precision TIG and MIG welded construction
• Made in USA at UMI's Philipsburg, Pennsylvania facility
• Universal fit designed to work with all rear end housings

These bolt-in replacement control arms are suitable for street driving, drag racing, and road course use. Installation typically takes 1-2 hours using basic hand tools. The combination of spherical bearings and on-car adjustability makes these control arms ideal for tuning suspension geometry without repeated disassembly. Whether you're launching at the strip or carving corners on a road course, UMI's 4037-B control arms deliver the strength and adjustability demanded by high-performance applications.