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Suspension and Components› Rear Suspension Components

UMI

On-Car Adjustable Lower Control Arms w/ Roto-Joints

$399.99 $349.99 Save $50.00

SKU: UMI-2039CM-B

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The UMI Performance UMI-2039CM-B is a set of on-car adjustable lower control arms designed for performance and street use. These control arms utilize Roto-Joint technology for bind-free performance and quiet operation, allowing for on-car adjustment to change the rear end length. This adjustment can help fit larger tires or center the rear end for improved stability and to prevent rubbing. The Roto-Joint features a greaseable delrin race for 28 degrees of movement, improving suspension articulation over factory bushings.
Show original supplier description
These arms feature UMI's patented Roto-Joint technology, which provides 28 degrees of unrestricted movement, allowing the suspension to articulate freely without binding. This is paired with polyurethane bushings on the chassis side to absorb road noise and shock, creating a comfortable yet precise handling experience. Constructed from 1.250" x 0.095" 4130 Chrome Moly steel, these control arms offer increased strength while reducing weight compared to factory stamped-steel units. They are TIG welded for superior structural integrity and feature a durable black powder-coat finish. The Roto-Joints are greaseable and rebuildable, and the arms are shipped fully assembled, utilizing OEM hardware for straightforward installation, which typically takes about two hours. These adjustable control arms allow for on-car length adjustments, enabling you to move the rear end forward or backward. This is beneficial for fitting larger tires or centering the rear axle in the chassis, preventing tire rub and improving overall vehicle stability. The design helps eliminate wheel hop and enhance traction under load. The UMI Performance UMI-2039CM-B control arms are designed to fit 1993-2002 Chevrolet Camaro and Pontiac Firebird models. Fitment should always be confirmed for your specific vehicle year, make, model, and trim.

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

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Specifications

BrandUMI
Part NumberUMI-2039CM-B
CategorySuspension and Components
5,000+ Trusted brands
1M+ Enthusiasts
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(760) 282-4645 hello@motormia.co

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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.

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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.

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