Prothane 4-1015 Polyurethane Leaf Spring Eye and Shackle Bushing Kit

The Prothane 4-1015 is a premium-grade polyurethane leaf spring eye and shackle bushing kit designed to replace worn or deteriorated OEM rubber bushings in leaf spring suspension systems. In leaf spring suspensions, the pivot points and shackle mounting locations endure constant, significant stress — making bushing condition critical to handling, load capacity, and overall suspension performance.

OEM rubber bushings are prone to cracking, collapsing, and degrading over time due to exposure to road grime, salt, and fluids. Once failed, a leaf spring's effectiveness is severely compromised, resulting in sloppy handling, excessive axle movement, and reduced load-bearing capability. Prothane's polyurethane compound is far more resistant to these conditions, maintaining its shape and performance for the life of the vehicle.

Key Features:

• Premium polyurethane construction — significantly more durable than OEM rubber, resistant to road grime, salt, and fluids
• Precision-fabricated sleeves included to ensure a correct, rattle-free fit
• Restores suspension geometry — reduces axle movement and helps maintain proper alignment angles
• Available in red or black — both colors use the same durometer (hardness); black includes a small amount of graphite which may further reduce squeaking
• Includes Prothane Super Grease — proper lubrication at installation is essential to prevent squeaking
• Made in the USA
• Lifetime warranty against defects in materials and workmanship for the original purchaser

Installation is straightforward for experienced DIYers. Clean mounting passages thoroughly before pressing in the new bushings, and apply all supplied Super Grease generously to each bushing to ensure quiet, long-lasting operation. All necessary hardware and sleeves are included for a complete installation.