UMI Performance 2039CM-B Adjustable Lower Control Arms Chrome Moly

The UMI Performance 2039CM-B adjustable lower control arms deliver bind-free suspension performance and on-car adjustability for GM muscle cars and performance vehicles. These premium chrome moly control arms allow you to fine-tune rear axle positioning for optimal tire fitment and improved handling characteristics.

Construction and Materials:

• Constructed from 1.250" x 0.095" DOM 4130 chrome moly steel tubing for maximum strength with reduced weight
• TIG welded 4140 chromoly tube adapters ensure structural integrity
• Heat-treated chromoly adjusters provide durability under high-stress conditions
• Durable powder coat finish resists corrosion and maintains appearance

Roto-Joint Technology:

• Features UMI's proprietary Roto-Joint spherical bearings for 28 degrees of total unrestricted movement
• 4140 chromoly hard chrome-plated spherical ball rotates in a precision-machined delrin race
• Eliminates suspension bind while maintaining street-friendly ride quality
• Greaseable and fully rebuildable design ensures long-term serviceability
• Adjustable tension ring allows fine-tuning as delrin race wears over time

Hybrid Bushing Configuration:

This control arm set features a street-performance oriented design with polyurethane bushings on the chassis end and Roto-Joints on the axle end. The polyurethane bushings absorb road noise and vibration before it reaches the passenger compartment, while the Roto-Joints provide precision articulation and bind-free operation. This combination delivers improved traction, reduced wheel hop, and enhanced handling compared to factory rubber bushings.

Adjustability and Installation:

• On-car adjustable length allows precise rear axle positioning without removal
• Adjust control arm length to center the rear axle or accommodate larger tires
• Essential for aftermarket rear axle installations to prevent tire rubbing
• Uses factory OEM hardware for straightforward installation
• Ships fully assembled and ready to install
• All pivot points are greaseable for low-maintenance operation

The UMI Performance 2039CM-B control arms are ideal for street performance enthusiasts seeking improved handling precision, adjustability, and durability without sacrificing ride comfort. The chrome moly construction provides professional-grade strength while keeping unsprung weight to a minimum.