UMI Performance 3628-B Roto-Joint Adjustable Rear Upper Control Arms

UMI Performance's 3628-B Roto-Joint Adjustable Rear Upper Control Arms are a premium suspension upgrade engineered for street, strip, and pro-touring applications. Built entirely in Philipsburg, PA, USA, these heavy-duty arms deliver superior handling, reduced wheel hop, and precise pinion angle tuning — all without removing them from the vehicle.

At the core of these control arms is UMI's in-house designed Roto-Joint spherical bearing, which dramatically minimizes suspension deflection for a crisp, responsive handling setup. Paired with UMI-designed and machined CrMo (chromoly) adjusters and threaded adapters, these arms offer exceptional strength and long-term durability under demanding conditions.

Key Features:

• UMI-designed Roto-Joint spherical bearings for reduced suspension deflection
• On-car adjustment — arms adjust while remaining bolted to the vehicle
• CrMo threaded adapters for superior thread strength and reliability
• UMI-designed and manufactured CrMo adjuster for precise tuning
• 3/8" thick CNC laser-cut upper mounting pads for rigidity and precision fitment
• Heavy-duty construction featuring a combination of TIG and MIG welding
• Durable powder coat finish for long-lasting corrosion resistance
• Compatible with all rear end housings
• Bolt-in installation — approximately 1–2 hours with basic hand tools
• Made in the USA — Philipsburg, PA

Whether you're tuning for the drag strip or carving corners on the street, the UMI Performance 3628-B upper control arms provide the strength, adjustability, and precision needed to launch harder and handle better.