UMI Performance 2034-B Tubular Lower Control Arms with Roto-Joint Technology

UMI Performance's 2034-B tubular lower control arms are engineered for 1982–2002 GM F-Body vehicles seeking maximum rear suspension performance on the street or track. Built from 1.500" x 0.120" DOM mild steel tubing and fully TIG welded, these arms deliver exceptional strength and rigidity over factory stamped-steel units. Each set ships fully assembled and ready to install using OEM hardware, finished in a brilliant and durable powder coat for long-lasting corrosion resistance.

Key Features:

• Constructed from 1.500" x 0.120" DOM mild steel tubing — fully TIG welded
• Roto-Joints installed on both ends of each control arm for maximum articulation
• 28 degrees of total unrestricted movement — eliminates suspension bind
• Greaseable and fully rebuildable Roto-Joint design for long service life
• 4140 chromoly, hard chrome-plated spherical ball rotating in a CNC-machined Delrin race
• Delrin race absorbs shock and road noise for smooth, quiet operation
• Significantly reduces wheel hop and improves traction over rubber or polyurethane bushings
• Ships fully assembled — uses OEM hardware for straightforward installation
• Durable powder coat finish included

About UMI Roto-Joint Technology:

The UMI Roto-Joint (Rotational Joint) is engineered to perform like a spherical rod end while retaining the streetable qualities of a compliant bushing. The joint features a 4140 chromoly, hard chrome-plated spherical ball that rotates freely within a CNC-machined Delrin race, providing 28 degrees of total rotation without restriction. Because the Delrin race does not deflect like rubber or polyurethane, the suspension articulates precisely — reducing wheel hop and improving traction under hard acceleration.

The Delrin material is chosen for its high wear resistance, excellent tensile strength, and dimensional stability. The Roto-Joint housing features 4140 chromoly threads and a CNC-machined bushing holder TIG welded together for maximum strength and durability. As the Delrin race wears over time, an adjustable ring can be tightened using the optional spanner wrench to restore proper tension — and if the race ever wears completely, it can be replaced individually, making these joints 100% rebuildable.

The included spanner wrench is used for adjusting and disassembling Roto-Joints across all UMI Performance products. Whether you're building a weekend cruiser, an autocross competitor, or a dedicated road race car, the 2034-B control arms offer a fully streetable, low-maintenance rear suspension upgrade.