Suspension and Components› Suspension Kits

UMI PERFORMANCE

UMI Performance 65-66 GM B-Body Adjustable Upper Control/Trailing Arm

$156.66

SKU: U01C 3657-B

Special Order
Special Order
Ships in 4–6 weeks
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The UMI Performance 3657-B is an adjustable rear upper control arm designed for the 1965-1966 GM B-Body vehicle. It serves as a direct replacement for factory arms, aiming to minimize wheel hop and enhance cornering performance. This control arm facilitates easy pinion angle adjustments without requiring removal from the vehicle.

Constructed with TIG welded mild steel tubing, it features greaseable polyurethane bushings and a durable powder coat finish. The arm includes a 4140 heat-treated CrMo adjuster for on-car adjustability and is compatible with both 3-link and 4-link rear suspension setups.

Fitment

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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 3657-B

Buy with Confidence

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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