Dorman 540-087 Suspension Ball Joint - Front Upper

Dorman 540-087 Front Upper Ball Joint

Dorman 540-087 is a threaded, press-in suspension ball joint for the front upper position on select GM and related vehicles. It is precision-engineered and tested as a direct replacement for the original equipment design, with fitment for Chevrolet Trailblazer, GMC Envoy, Saab 9-7x, and other listed applications.

Key Features

• Front upper suspension ball joint for select vehicles
• Threaded design with press-in mounting type
• Steel construction with grey finish
• Dust boot included for joint protection
• Greaseable design for serviceability
• Premium suspension grade type
• Mounting hardware included
• 12 mm wrench size

Product Details

This Dorman suspension ball joint, part number 540-087, is built for the front upper suspension location and follows the OE-style geometry needed for proper steering and suspension operation. The steel body, polychloroprene dust boot, and greaseable construction support long-term service in demanding front-end applications. It cross-references MOOG Chassis Products K6664 for the same application.

Compatible With 2002-2009 Chevrolet Trailblazer, front upper; 2002-2009 GMC Envoy, front upper; 2005-2009 Saab 9-7x, front upper; 2003-2008 Isuzu Ascender, front upper; 2004-2007 Buick Rainier, front upper; 2003-2006 Chevrolet SSR, front upper; 2002-2006 Chevrolet Trailblazer EXT, front upper; 2002-2006 GMC Envoy XL, front upper; 2004-2005 GMC Envoy XUV, front upper; and 2002-2004 Oldsmobile Bravada, front upper.

What It Helps Address

• Front-end looseness or play from a worn upper ball joint
• Clunking or knocking noises over bumps
• Uneven tire wear related to suspension wear
• Steering wander or reduced directional stability
• Inspection failure caused by excessive joint movement

Installation Notes

Install this ball joint in the front upper suspension position only on the listed applications. Because it uses a press-in mounting type, proper suspension service tools and correct press procedures are important for installation. Verify the vehicle application, orientation, and torque specifications before final assembly. The pinch-style stud and 12 mm wrench size should be matched to the vehicle’s service requirements.

Quality Assurance

Dorman engineers this replacement ball joint to meet the needs of specific OE applications and subjects it to testing for reliable fit and function. Part number 540-087 is built as a premium suspension replacement for select Chevrolet Trailblazer, GMC Envoy, and related front upper applications.