Dorman 540-091 Suspension Ball Joint - Front Lower

Dorman 540-091 Front Lower Ball Joint

Dorman 540-091 is a threaded suspension ball joint for front lower applications on select Buick, Cadillac, Oldsmobile, and Pontiac vehicles. It is precision-engineered and tested as a direct replacement for the original equipment part on the listed applications, including Buick LeSabre, Buick Park Avenue, Cadillac DeVille, Cadillac Seville, Pontiac Bonneville, Buick Riviera, and Oldsmobile Aurora.

Key Features

• Front lower suspension ball joint for select GM vehicles
• Threaded, bolt-in mounting type with 3 mounting holes
• Steel construction with grey finish
• Dust boot included with polychloroprene boot material
• Castle nut included and cotter pin hole provided
• Premium suspension grade type
• Wrench size: 12 mm
• Stud type: tapered

Detailed Description

This Dorman suspension ball joint, part number 540-091, is built for front lower suspension service where OE-style fit and geometry matter. It uses a threaded design with bolt-in mounting and a tapered stud, along with a dust boot to help protect the joint interface. The steel body and premium suspension grade construction support dependable replacement performance on the specified vehicles. This part cross-references MOOG Chassis Products K5333 for the same application.

Compatible With 2000-2005 Buick LeSabre, front lower; 1997-2005 Buick Park Avenue, front lower; 2000-2005 Cadillac DeVille, front lower with standard suspension; 2000-2005 Pontiac Bonneville, front lower; 2000-2004 Cadillac Seville, front lower with standard suspension; 1997-1999 Buick Riviera, front lower; and 1997-1999 Oldsmobile Aurora, front lower. Dorman 540-091 is a direct-fit suspension ball joint for these listed applications.

Common Repair Uses

• Restores worn front lower ball joint service on GM full-size sedans
• Addresses looseness or play in the front suspension
• Helps correct clunking or popping noises from the lower control arm area
• Supports proper steering response when the original joint is worn
• Replaces a damaged or corroded OE-style ball joint assembly

Installation Notes and Tips

Verify vehicle year, make, model, and suspension configuration before installation. This part is listed for front lower positions, with standard suspension noted for Cadillac DeVille and Cadillac Seville applications. Inspect the control arm, mounting points, and related hardware for wear before assembly. Use the specified 12 mm wrench size and confirm the tapered stud seats correctly during installation.

Quality Assurance

Dorman engineers and tests this ball joint as a replacement for the original equipment part on the listed vehicles. The part number is 540-091.