Prothane 71710-BL GM Rear Upper Coil Spring Isolator Set Polyurethane Black

The Prothane 71710-BL rear upper coil spring isolators are precision-molded from premium-grade polyurethane, offering a direct upgrade over the soft OEM rubber isolators found on 1991–1996 GM vehicles. Polyurethane construction delivers improved rigidity and resilience, helping to maintain proper coil spring alignment and reduce unwanted suspension noise and deflection.

Key Features:

• Premium polyurethane construction — harder and more durable than factory rubber, resists compression set over time
• Improved suspension rigidity — reduces spring movement and helps maintain proper suspension geometry
• Super-grease compatible — designed to retain lubricant for quiet, rattle-free operation
• Precision-molded fitment — engineered to match OEM dimensions for a drop-in installation
• Black finish — classic Prothane black polyurethane for a clean under-vehicle appearance
• Direct OEM replacement — replaces worn or deteriorated factory rubber isolators

These isolators install between the coil spring and the upper spring perch, cushioning the spring and protecting the body from vibration and road noise. Upgrading to polyurethane helps extend the life of your suspension components while providing a more responsive, controlled ride compared to aging factory rubber.