UMI Performance 3657-R Upper Control Arm for GM B-Body - 1965-66

The UMI Performance 3657-R is a high-performance upper control arm designed specifically for 1965-66 GM B-Body vehicles. This direct replacement control arm features on-car adjustability, allowing you to make pinion angle adjustments without removing the arm from the vehicle—a significant advantage over competitor designs that require complete removal for adjustment.

Key Features:

• On-car adjustable design using a 4140 heat-treated chrome-moly adjuster with left and right hand threads
• TIG welded construction for superior strength and durability
• 4140 chrome-moly tube adaptors for maximum reliability
• Greaseable Energy Suspension polyurethane bushings for reduced friction and long service life
• Durable powder coat finish for corrosion resistance
• Eliminates the need for shims during installation through easy adjustment

Performance Benefits:

• Minimizes wheel hop for improved traction
• Enhances cornering stability and control
• Improves track consistency for racing applications
• Replaces worn factory components with premium materials

Important Note: This control arm is sold individually. Verify your vehicle's rear suspension configuration before ordering. Six-cylinder and most small-block GM B-Body vehicles were equipped with a 3-link rear suspension requiring one upper control arm, while big-block vehicles used a 4-link setup requiring two upper control arms. Adjustment is simple—just loosen two jam nuts and turn the adjuster to achieve the desired pinion angle.