Prothane 6-303-BL Black Polyurethane Rear Control Arm Bushing Kit

The Prothane 6-303-BL is a black polyurethane rear lower control arm (C-arm) bushing kit engineered as a direct performance upgrade over the factory rubber bushings on the 1984–1986 Ford Mustang SVO. Worn or soft OEM rubber bushings allow the rear control arms to flex and shift under load, degrading handling precision and making it difficult to maintain consistent alignment geometry. Prothane's polyurethane formulation delivers significantly greater compliance resistance, keeping the rear axle firmly located during acceleration, braking, and cornering.

Key Features:

• Polyurethane construction — firmer than OEM rubber for improved suspension control and reduced deflection
• Black color with graphite-infused compound to help minimize noise and squeaking
• Direct-fit replacement — designed specifically for the 1984–1986 Ford Mustang SVO rear C-arm mounting points
• Maintains alignment settings — reduced bushing flex helps preserve caster and camber values under dynamic loads
• Helps eliminate wheel hop and axle shudder during hard acceleration
• Lifetime warranty — Prothane guarantees against defects in materials and workmanship for the life of the original purchaser's vehicle
• Includes pre-lube for proper installation and long-term squeak-free performance

Prothane polyurethane suspension components are purpose-built as a performance upgrade over soft factory rubber. Proper greasing with the supplied lubricant at installation is recommended to ensure quiet, long-lasting operation. This kit is intended for off-road or competition use where applicable regulations apply.