Prothane 4-1005 Polyurethane Leaf Spring Eye Bushing Kit Full-Size 1-Inch ID

The Prothane 4-1005 is a polyurethane leaf spring eye bushing kit designed as a direct, performance upgrade over worn factory rubber bushings on Dodge full-size trucks and SUVs. Engineered specifically for 1-inch ID spring eyes, this kit restores suspension integrity and improves chassis response.

OEM leaf spring setups rely on soft rubber bushings to mount the spring to the frame. While rubber reduces noise initially, it degrades quickly under the stress of heavy loads and exposure to road grime, leading to slop, reduced load-carrying ability, and diminished ride quality. Prothane's premium polyurethane construction resists wear, moisture, and road contamination far better than rubber — delivering long-lasting performance.

Key Features:

• Premium polyurethane construction — outlasts OEM rubber bushings
• 1-inch ID spring eye fitment — precision fit for full-size Dodge applications
• Resists road grime, oils, and environmental degradation
• Restores suspension feel and reduces leaf spring slop
• Includes Prothane Super Grease — apply during installation to prevent squeaking
• Lifetime warranty against defects in materials and workmanship for original purchaser
• Available in red or black (same durometer/hardness — black formula includes graphite for additional squeak resistance)

Important Notes: This kit fits 1-inch diameter spring eyes only. Does not include frame shackle bushings. Apply supplied grease thoroughly to each bushing at installation to ensure squeak-free operation.