Prothane 7-1139-BL Rear Sway Bar Bushing Kit 23mm Black GM S-Series

The Prothane 7-1139-BL is a black polyurethane rear sway bar bushing kit designed for 2WD Chevy and GMC S-Series trucks, Blazers, and Jimmy models. Upgrading from the factory rubber bushings to Prothane's precision-engineered polyurethane units delivers firmer, more consistent bar retention and noticeably improved body roll control—without the expense of installing a larger sway bar.

Key Features:

• 23mm bore diameter — engineered for the factory rear stabilizer bar diameter on GM S-Series applications
• Polyurethane construction — resists compression, wear, and deformation far longer than OEM rubber bushings
• Grooved bore design — retains Prothane's super grease for quiet, rattle-free operation
• Black color (–BL suffix) — also available in red (PN 7-1139)
• Includes stud end to eye bolt type end links — complete kit for a direct replacement installation
• Sold as a pair — both bushing positions covered in one kit
• Lifetime warranty — backed by Prothane's limited lifetime guarantee
• Made in the USA

OEM-style rubber sway bar bushings are prone to compressing and hollowing out over time, allowing the bar to shift under load and reducing its effectiveness at controlling body roll. Prothane's polyurethane formulation maintains its shape and grip mile after mile, whether the vehicle sees daily commuting or more demanding driving conditions. The grooved inner bore holds lubricant in place, ensuring quiet operation throughout the bushing's service life.