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Suspension and Components› Rear Suspension Components
UMI PERFORMANCE
UMI Performance 64-72 GM A-Body Double Adjustable Lower Control Arms
SKU: U01C 4027-B
Easy — 1–2 hours
Overview
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Part #: 4027-B
Some competitors may consider these "Race Only" control arms while we consider them Race Ready. Our double adjustable lower control arms feature TIG welded fabrication, reinforced sway bar holes and QA1 Endura Series Teflon lined spherical rod ends. When you are looking for the maximal performance from your vehicle, you can't go wrong with this setup. The spherical bearing rod ends operate for a "bind" free operation when high handling is a concern and are designed to eliminate rear-end bind found with rubber and polyurethane bushings. This item also works excellent as a solid bushing drag race control arm and is designed to with stand high amounts of torque and horse-power. The TIG welded construction adds higher penetration for a much stronger weld over the commonly used MIG welding process. Each control arm features the correct provisions for adding a stock or aftermarket sway bar. Sway bar holes are reinforced with a 0.120" wall thickness steel sleeve TIG welded and sanded into place. The construction of the control arms features 0.120" x 1.500" mild steel DOM tubing and each end utilizes tube adapters CNC machined from 4140 Chrome Moly to ensure overall strength and improved thread durability; this is an area other competitors use mild steel as a cost saver. Features: - Constructed of 0.120" x 1.500" DOM Steel Tubing - 4140 Chrome Moly Threaded Tube Adapters - QA1 3/4" Hard Chrome Plated, Teflon/Kevlar Self Lubricating Race Rod End - Complete Arm Features TIG Welded Construction - CNC Machined 6061 Aluminum Step Bushings with Zinc Plated Steel Sleeves - Quick On-Car Adjust-ability Using Right and Left Hand Threads - Brilliant Durable Powder Coat - Uses OEM Hardware and sway bar Installation: Easy 1-hour bolt-on installation requires no drilling, uses OEM hardware.
This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Vehicle Symptoms
- Rear-end bind when accelerating from a stop
- Wheel hop during hard launches
- Excessive body squat on acceleration
- Rear end feels loose or unstable at high speeds
- Uneven tire wear on rear tires
Relevant Conversations
- 64-72 Chevelle rear lower control arms upgrade
- Double adjustable control arms for drag racing
- UMI Performance 4027-B review forum
- How to install rear lower control arms on GM A-body
- Rear end bind when launching my Chevelle
- Best control arms to eliminate wheel hop
- QA1 spherical rod ends vs poly bushings review
- Coil spring relocation kit for drag racing
- Car squats unevenly under acceleration fix
- Upgrade rear suspension for 500hp drag car
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
| Brand | UMI PERFORMANCE |
| Part Number | U01C 4027-B |
About MOTORMIA
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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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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.
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