Dorman 540-088 Suspension Ball Joint - Front Lower

Dorman 540-088 Front Lower Ball Joint

Dorman 540-088 is a threaded, press-in suspension ball joint built for front lower applications on select GM and related vehicles. It is precision-engineered and tested for reliable OE-style replacement on vehicles such as the Chevrolet Trailblazer, GMC Envoy, and Saab 9-7x.

Key Features

• Threaded, press-in suspension ball joint for front lower mounting locations
• Steel construction with gray finish
• Dust boot included for joint protection
• Greaseable design for serviceability
• Premium suspension grade type
• Mounting hardware included
• 12 mm wrench size and tapered stud design

Detailed Description

This Dorman suspension ball joint is designed as a direct replacement for the original equipment part on specific front lower suspension applications. The steel body, polychloroprene dust boot, and greaseable construction support long-term service in demanding suspension environments. Part number 540-088 is a fitment-based replacement for vehicles including the 2002-2009 Chevrolet Trailblazer, 2002-2009 GMC Envoy, 2005-2009 Saab 9-7x, 2003-2008 Isuzu Ascender, 2004-2007 Buick Rainier, 2003-2006 Chevrolet SSR, 2002-2006 Chevrolet Trailblazer EXT, 2002-2006 GMC Envoy XL, 2004-2005 GMC Envoy XUV, and 2002-2004 Oldsmobile Bravada. This part cross-references MOOG Chassis Products K6663 and TRW JBJ847 for the same application.

What It Helps Address

• Front suspension looseness or play at the lower control arm
• Clunking or knocking from worn ball joint components
• Uneven tire wear related to suspension joint wear
• Steering instability or wandering at the front end
• Inspection failures caused by excessive joint movement

Installation Notes and Tips

Verify front lower fitment by year, make, and model before installation. This is a press-in, threaded ball joint, so proper suspension service tools are recommended for removal and installation. Confirm the tapered stud interface, wrench size, and mounting orientation match the original part on the vehicle. For applications such as Chevrolet Trailblazer, GMC Envoy, and Saab 9-7x, compare the original joint dimensions and mounting style to Dorman 540-088 before assembly.

Quality Assurance

Dorman states that this ball joint is precision-engineered and rigorously tested to provide a reliable replacement for the original equipment on specific vehicles. The premium suspension grade construction is intended to meet the demands of front lower suspension service on covered applications.