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

UMI Performance's 4037-R adjustable rear upper control arms are engineered for street, strip, and pro-touring applications, delivering precision handling and improved suspension geometry. These premium control arms feature UMI's proprietary Roto-Joint spherical bearings that virtually eliminate suspension deflection, resulting in crisp handling, easier pinion angle adjustment, and reduced wheel hop during hard launches.

Key Features:

• UMI-designed Roto-Joint spherical bearings for minimal deflection and maximum performance
• On-car adjustability using UMI's custom-designed chromoly (CrMo) adjuster—no removal required
• CNC laser-cut 1/4-inch thick upper mounting pads for superior strength
• Chromoly threaded adapters provide exceptional thread strength and durability
• Durable powder coat finish for long-lasting corrosion resistance
• Heavy-duty construction with precision TIG and MIG welding
• Compatible with all rear end housing types
• Made in Philipsburg, Pennsylvania, USA

These bolt-in replacement control arms install in approximately 1-2 hours using basic hand tools. The combination of UMI's in-house designed and machined chromoly adjuster with premium Roto-Joints delivers ultimate strength for demanding performance applications. Whether you're launching at the drag strip or carving corners on a road course, these control arms provide the bulletproof reliability and adjustability serious enthusiasts demand.