Prothane 1-815BL Greaseable Rear Spring & Shackle Bushing Kit Black

The Prothane 1-815BL is a premium-grade polyurethane greaseable spring and shackle bushing kit designed as a direct upgrade over worn or soft OEM rubber bushings. In leaf spring-type suspensions, enormous forces concentrate at the pivot points and shackles — making bushing quality critical to ride quality, load capacity, and handling precision. Prothane's polyurethane construction is significantly more durable than factory rubber, resisting road grime, oils, and general wear that cause rubber bushings to deteriorate prematurely.

What's Included:

• 8 polyurethane bushings (upper and lower positions)
• 4 precision-fabricated inner sleeves
• 4 greaseable bolts
• 4 lock nuts
• 8 flat washers

Key Features:

• Greaseable design — greaseable bolts allow lubrication at the bushing interface for quiet, squeak-free operation
• Black polyurethane with graphite infusion — the black compound includes a small amount of graphite blended into the urethane to further aid in noise reduction
• Precision-fabricated sleeves — machined to exact tolerances for a proper, rattle-free fit
• Improved load capacity and towing performance — firmer bushing material maintains leaf spring geometry under load better than OEM rubber
• Lifetime warranty — Prothane backs all bushing kits with a lifetime defect warranty for the original purchaser

This kit covers both upper and lower shackle positions and ships as a complete hardware kit — no need to source additional bolts, nuts, or washers. Proper lubrication with Prothane Super Grease at installation is strongly recommended to ensure long-term, squeak-free performance.