- Axle Damper
- Panhard Bar
- Sway Bar
- Upper Control Arm
Up until 2004, the late model Mustang used a four-link rear suspension. Two upper and two lower control arms hold the rear axle in place, giving the suspension its four-link moniker. Springs are used to support the rear of the car, above the axle, with separate shocks installed to control the dampening. Depending upon whether the Mustang is a V6 or V8, it has a 7.5 or an 8.8 inch rear end. The 7.5 uses an open differential, while the GT's 8.8 inch rear end uses Ford's Traction-Lok differential. The 8.8 inch rear end was also equipped with quad-shocks during these years, which help dampen the axle and reduce wheel hop. A sway bar is installed on both versions of the rear end to help control body roll.
The rear suspension underwent a significant change in the 2005 model year, in the form of how the rear axle is positioned under the car. The four-link suspension setup was nixed in favor of a three-link panhard bar setup. The panhard bar is tasked with the job of properly locating the rear axle from left to right. The change to this arrangement was a tradeoff between a full independent rear suspension and a solid axle. An independent rear suspension would have added a substantial cost to the initial price of the Mustang. In addition, many Mustang enthusiasts prefer a solid axle anyway, as it's more suitable for dragstrip duties. The panhard bar setup still allows the Mustang to keep the solid axle, while providing cornering ability improvements that suit most owners better than previous generations of the Mustang.