Suspension and Components› Rear Suspension Components

UMI PERFORMANCE

UMI Performance 82-02 F-Body On-car Adjustable Control Arms- Poly/Roto-Joint

$349.99

SKU: U01C 2039CM-B

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The UMI Performance Rear Adjustable Lower Control Arms are designed to minimize wheel hop and improve cornering for the 1982-2002 Chevrolet Camaro and Pontiac Firebird. These direct bolt-on replacements are constructed from DOM mild steel tubing with a 4130 chromoly threaded tube adapter, CNC-machined, and fully TIG-welded for strength. They feature reinforced spring perches and heavy-duty sway bar mounting points.

These control arms utilize PTFE-lined spherical rod ends for quiet, bind-free performance, making them suitable for track and autocross applications. They also include polyurethane bushings for comfortable, quiet operation when bolted to the chassis. The arms are finished with a black powdercoat and utilize OEM hardware.
Show original supplier description

Part #: 2039CM-B

UMI's on car adjustable lower control arms utilize our Roto-Joint technology for a bind free performance, quiet ride quality, and also offer on car adjustment. The control arms can be adjusted longer or shorter moving the rear end back or forward to accommodate larger tires in the fender wells. Adjustable control arms are also recommended for aftermarket rear end installs to center the rear end and prevent tire rubbing. The installed Roto-Joint is a pivot ball lined with a greaseable delrin race designed to offer 28 degrees of total unrestricted movement, improving performance and providing precision handling. The Chrome Moly version uses 1.250" x 0.095" 4130 Chrome Moly steel for increased strength and reduced weight. UMI's Roto-Joint allows 28 degrees of total rotation and unrestricted movement throughout the vehicle's suspension, preventing bind and improving traction. The Roto-Joint features a 4140 chrome moly, hard chrome plated spherical ball rotating in a delrin race for wear resistance and durability. The Roto-Joint is adjustable and rebuildable, ensuring longevity and performance. The spanner wrench is used for adjusting and disassembling Roto-Joints for maintenance and rebuilding.

This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandUMI PERFORMANCE
Part NumberU01C 2039CM-B

About MOTORMIA

5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy