Prothane 6-312 Mustang Rear Upper & Lower Control Arm Bushing Kit Polyurethane

The Prothane 6-312 is a complete rear control arm bushing kit covering both the upper and lower control arms. Constructed from premium-grade polyurethane, these bushings deliver a significant upgrade over factory rubber, restoring and improving suspension performance by reducing unwanted flex and deflection in the rear suspension.

Worn or soft OEM rubber bushings allow the rear control arms to shift under load, leading to wheel hop during hard acceleration and imprecise alignment behavior over time. The firmer durometer polyurethane compound used in this Prothane kit resists that deflection, keeping the rear axle properly located and your alignment settings accurately maintained.

Key Features:

• Covers both upper and lower rear control arm positions — one kit, both sides
• Premium polyurethane construction — firmer than OEM rubber for reduced bushing deflection
• Helps eliminate wheel hop and rear-end shudder under hard acceleration
• Improved compliance resistance keeps alignment settings stable
• Available in red or black — same durometer and performance in either color
• Includes Prothane Super Grease for proper lubrication at installation
• Backed by Prothane's lifetime warranty against defects in materials and workmanship

Proper lubrication with the included grease at installation is essential to prevent squeaking and ensure long service life. These bushings must be pressed into the rear control arms and may require reuse of the factory metal shells depending on the application.