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Prothane's polyurethane is a stronger material for the mounting points of a leaf spring and shackle. Leaf spring and shackle bushings handle a lot of stress from the vehicle load, so be sure to use the supplied Prothane's Super Grease to lubricate the bushings during installation.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.