Whiteline Rear Upper Control Arm – 2005-2011 Ford Mustang

Whiteline Rear Upper Control Arm – 2005-2011 Ford Mustang

Fix the Rear Geometry on Your S197 Mustang
The 2005-2011 Ford Mustang S197 runs a solid rear axle with a Panhard rod and upper/lower control arm arrangement. The stock upper control arm geometry is adequate for street use but produces significant rear steer and axle path problems when the car is lowered or used at the track. Whiteline’s adjustable rear upper control arm allows correction of pinion angle and rear axle geometry to compensate for ride height changes and improve high-speed stability.

DETAILS

• Adjustable rear upper control arm for 2005-2011 Ford Mustang (S197)
• Allows correction of pinion angle and rear axle path geometry
• Addresses rear steer tendency on lowered S197 applications
• Polyurethane bushing on chassis end for reduced compliance
• Heavy-duty construction for track and spirited street use
• Direct bolt-in: no modification to chassis required

Why the S197 Needs Geometry Correction
The solid rear axle on the S197 Mustang works well at stock ride height where the geometry was designed to operate. When the car is lowered — even modestly — the upper control arm angle changes, which alters pinion angle, introduces axle path deviation, and can create rear steer under load. The result is instability at high speed and inconsistency under hard cornering. Whiteline’s adjustable arm addresses the root cause.

Pinion Angle Matters for More Than Driveline Vibration
Pinion angle is often discussed in terms of driveline vibration, but it also affects how the rear axle reacts to power application and suspension travel. Correct pinion angle reduces axle wind-up tendencies and improves traction under acceleration. Combined with corrected rear steer geometry, the improvement in straight-line stability and corner exit traction is significant.

S197 Track and Performance Use
The S197 Mustang is a serious platform for drag racing, road course work, and autocross. Whiteline’s rear suspension components for the S197 are designed with that use in mind — durable enough for repeated track sessions, precise enough to make a measurable difference in lap times and consistency.

Why Choose Whiteline

Whiteline has been engineering suspension components from their facility in Australia since 1979. Every product in their catalog is developed with a clear goal: measurable improvement in handling, stability, and tyre contact. Whiteline’s polyurethane bushings, sway bars, control arms, and alignment correction kits are engineered using finite element analysis and validated on track before they reach the market. Their components are direct-fit, bolt-on solutions designed for enthusiasts who want real performance gains without fabrication or custom work.

The RallySport Take

One of the most effective rear suspension upgrades available for the S197. If your Mustang is lowered and you’ve noticed rear instability or inconsistent behavior under load, this is the first place to look.

What’s in the Box

• Adjustable rear upper control arm for 2005-2011 Ford Mustang (S197)
• Allows correction of pinion angle and rear axle path geometry
• Addresses rear steer tendency on lowered S197 applications
• Polyurethane bushing on chassis end for reduced compliance
• Heavy-duty construction for track and spirited street use

Fitment