Whiteline Adjustable Rear Upper Control Arm - S197 Chassis

Whiteline's Adjustable Rear Upper Control Arm line for the S197 chassis is a purpose-engineered solution to one of the most well-known performance limitations of the stock solid-axle rear suspension: brake hop and axle tramp. Designed to serve street drivers, track day enthusiasts, and competitive racers alike, this control arm line delivers measurable improvements in rear-end stability and suspension geometry without sacrificing everyday drivability.

The factory S197 third-link rear suspension relies on an ultra-compliant rubber bushing optimized for ride comfort — not performance. Under hard acceleration or heavy braking, this compliance translates directly into brake hop and axle tramp. Whiteline's upper control arm line addresses these shortcomings through a combination of advanced materials, intelligent geometry, and a proprietary bushing design that outperforms both OEM rubber and commonly used bearing-style alternatives.

Key Features:

• 4130 Chromalloy Construction — High-strength alloy steel provides superior rigidity and long-term durability under demanding street and track conditions
• Extended Arm Length Design — Corrects instant center geometry to reduce brake hop and wheel hop under hard acceleration
• Synthetic Elastomer Bushing — Delivers increased rear-end stability without the NVH harshness associated with bearing-style designs, preserving daily drivability
• Eccentric Crush Tube Adjustment — Enables on-car pinion angle and instant center adjustment without weakening the arm through a turnbuckle-style modification
• Pinhole Voiding — Allows the bushing to articulate freely through the full range of suspension travel without binding
• Heavy-Duty Mount Design — Reinforced mounting point increases overall arm rigidity for consistent, predictable handling
• Protective Plating — Hard-wearing finish on all metal components resists corrosion and outperforms conventional paint in harsh conditions
• Universal S197 Fitment — Engineered to fit all production years of the S197 chassis platform

What sets Whiteline's approach apart is the eccentric crush tube adjustment system, which allows geometry tuning — pinion angle and instant center — directly on the vehicle, without the structural compromise of a threaded turnbuckle design. The arm retains its full strength while still offering the adjustability needed to dial in suspension geometry for any application, from street cruising to wheel-to-wheel road racing.

Backed by Whiteline's global reputation for precision suspension engineering, this upper control arm line represents a proven, bolt-in performance upgrade trusted by enthusiasts worldwide — whether setting up for the street, the drag strip, or the road course.