UMI Performance · New
UMI Performance 67-70 GM B-Body Adjustable Upper Control/Trailing Arm
MPN 3662-B · Store SKU umi3662-B
Supplier stock checked 11/7/2026, 8:48:45 AM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
UMI Performance offers an on-car adjustable control arm for the rear of the GM B-Body vehicle. This rear upper control arm for the 65-66 GM B-Body is a direct replacement for the factory arms and is designed to minimize wheel hop, improve corning, and help track consistency. It allows for easy pinion angle adjustments without the need to remove it from the vehicle. The control arm features greaseable bushings, TIG welded construction, and a 4140 heat treated Chrome-Moly adjuster. 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’s 3662 rear upper control arm is a direct replacement that reduces wheel hop, improves cornering, and boosts track consistency. Easy on-car pinion angle adjustments with greaseable bushings, TIG welds, and a 4140 Chrome-Moly adjuster. UMI B-Body upper arm improves handling and allows easy pinion tuning.
Manufacturer fitment & guides
Check 3662-B against the manufacturer’s application information below.
Part-specific notes
- California Proposition 65: Y
