Upper Control Arms

Adjustability is crucial when it comes to tuning your street car's suspension. Our Ultimate "on-car" adjustable upper control arms for the rear of your GM vehicle have been meticulously designed with the best materials and components available. We have replaced weak areas with aircraft quality 4140 Chrome Moly steel and utilized TIG welded construction for maximum durability. These control arms feature high quality QA1 spherical rod ends for a smooth and quiet operation. The Teflon lined rod ends prevent metal to metal contact, eliminating unwanted noise. The on-car adjustability of our Ultimate Arms makes it easy to make pinion angle adjustments, whether in the garage or at the track. With UMI's unique Chrome Moly on-car adjuster, you can quickly lengthen or shorten the control arm length with just two jam nuts. Pinion angle adjustments are essential for improving track 60-foot times, increasing traction, and reducing wheel hop. The bind-free operation of our rod ends makes them a great upgrade for both track and auto cross driven cars. Trust only the best-QA1 for long lasting performance.

Additional Information

UMI’s Ultimate adjustable rear upper control arms feature 4140 Chrome Moly construction, QA1 Teflon-lined rod ends, and on-car adjustability for easy pinion angle tuning. They reduce wheel hop, improve traction, and are track-ready.

• 4140 Chrome Moly tube adaptors
• Alloy steel, heat treated, hard chrome plated rod ends
• Bind free operation for smooth performance
• CNC machined 0.250" mild steel upper control arm mounting points
• High strength 4140 Chrome Moly heat treated 1.000" solid adjuster
• Made from aircraft quality 4140 Chrome Moly steel
• On-car adjustability for ease of adjustment
• Pinion angle adjustments for track performance
• Suitable for track and auto cross driven cars
• Supplied with high quality QA1 spherical rod ends
• Teflon/Kevlar self lubricating race in rod ends
• TIG welded construction
• Ultimate "on car" adjustable upper control arms

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Product Downloads

#	Document Type	Download
1.	Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Reference Information