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UMI Performance

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

MPN: 3657-b Catalog #: 001588432 Category: Control Arms Check Vehicle Fitment

Product Details

Note: This item is sold each. Please verify whether your vehicle has (1) or (2) upper control arms. Six cylinder and most small block vehicles were supplied with a 3-link rear suspension while big block vehicles used a 4-link set-up.

UMI Performance offers one of the only on-car adjustable control arms for the rear of the GM B-Body vehicle. This rear upper control arm for the 65-66 GM B-Body is an excellent solution when looking to replace the worn out factory set-up. Our rear upper control arms are a direct replacement for the factory arms and are designed to minimize wheel hop, improve cornering and help track consistency. This control arm is on-car adjustable and allows easy pinion angle adjustments. Adjustments are made while the control arm stays attached to the vehicle. Competitor designs require you to remove the control arm from the vehicle to adjust. Adjustment can also be used to eliminate the use of shims during installation. Adjusting the control arm is as easy as loosening two jam nuts and turning 4140 Heat Treated Chrome-Moly Adjuster that utilizes left and right hand threads.

UMI’s on-car adjustable rear control arm for GM B-Body replaces factory arms to cut wheel hop and sharpen cornering. Features greaseable bushings, TIG-welded strength, and a 4140 Chromoly adjuster. Fits 3-link or 4-link setups.

- On-Car Adjustability using a 4140 Heat Treated Adjuster - 4140 Chrome-Moly Tube Adaptors - TIG Welded Construction - Grease-able Energy Suspension Polyurethane Bushings - Brilliant Durable Powder Coat

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

1965-1966 GM B-Body Adjustable Upper Control/Trailing Arm

Upper Control Arms

Vehicle Fitment

Please verify year, make, model, and any notes before ordering.

Product Specs

Brand
UMI Performance
Part Number
3657-b
Catalog Number
001588432
Product Line
Lower Control Arms
Category
Suspension
Type
Control Arms
UPC / Barcode
3657-B
Vendor Product Category
Suspension
Vendor Product Subcategory
Control Arms
Length
12.00 in
Width
6.00 in
Height
6.00 in
Weight
6.00 lb
Units Per SKU
1
Freight / LTL
No
Air Restricted
No
Prop 65
Y
CARB Approved
Yes
Clearance Item
No

Shipping & Availability

Current status 2 Available - Ready to ship
Estimated timing Ships from factory

This item is showing manufacturer availability and may ship directly from the manufacturer. Tracking details are provided as soon as they become available. ETA 0-5 Days to ship.

PROP 65 WARNING: This product can expose you to chemicals, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Inventory shown: 2 available as of 6/4/2026.

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