UMI Performance 2035CM-R Double Adjustable Rear Lower Control Arms Chromoly Red Pair

The UMI Performance 2035CM-R is a pair of double adjustable rear lower control arms constructed from lightweight, high-strength 1.250" x 0.095" 4130 chromoly steel tubing. The chromoly construction delivers increased strength over standard mild steel while reducing overall weight — making these arms an excellent choice for performance street driving, autocross, road racing, and drag racing applications.

Each arm ships fully assembled and ready to install, utilizing OEM-compatible hardware for a straightforward bolt-on fitment. On-car length adjustment is simple: loosen the jam nuts and turn the arm using the left and right hand threaded ends to shorten or lengthen without removing the arm from the vehicle. This makes it easy to center a rear end after lowering, gain tire clearance in the fender wells, or accommodate aftermarket rear end swaps.

UMI Roto-Joint Technology:

Both ends of each control arm are fitted with UMI's proprietary Roto-Joint — a rotational pivot designed to allow 28 degrees of total unrestricted movement. The Roto-Joint features a 4140 chromoly, hard chrome-plated spherical ball rotating inside a CNC-machined Delrin race. Unlike rubber or polyurethane bushings, the Delrin race does not deflect under load, resulting in improved traction, significantly reduced wheel hop, and more precise handling. Delrin is the preferred bushing material for this application due to its excellent tensile strength, wear resistance, and dimensional stability.

The Roto-Joint housing is constructed from 4140 chromoly threads and a CNC machined bushing holder, TIG welded together for maximum strength and durability. All Roto-Joints are greaseable and fully rebuildable — if the Delrin race wears over time, the adjuster ring can be tightened using an optional spanner wrench to restore tension, or the race can be replaced entirely. TIG welded 4140 chromoly threaded tube adapters provide the connection between the DOM tubing and the Roto-Joints.

Key Features:

• Constructed from 1.250" x 0.095" 4130 chromoly steel tubing for reduced weight and increased strength
• Swivel Roto-Joints installed on both ends for 28 degrees of total unrestricted suspension movement
• 4140 chromoly spherical ball with hard chrome plating for superior wear resistance
• CNC-machined Delrin race eliminates bushing deflection, reducing wheel hop and improving traction
• TIG welded 4140 chromoly threaded tube adapters
• On-car adjustable via left and right hand threads — no removal required
• Greaseable and fully rebuildable Roto-Joints for long service life
• Uses OEM hardware for easy installation
• Durable powder coat finish in red
• Shipped fully assembled and ready to install
• Sold as a pair

These double adjustable rear lower control arms are an ideal upgrade for performance-minded builders seeking bind-free suspension articulation with the quiet, streetable ride quality of a compliant bushing and the precision of a solid spherical setup. Equally at home on a weekend cruiser or a dedicated race car.