Cognito Alpha Series Upper Ball Joint for 1999-2020 Chevrolet/GMC 1500 (199-91320)

Fits select 1999-2020 Chevrolet Silverado, Suburban, Tahoe and GMC Sierra, Yukon, and Yukon XL 1500 models.

The Cognito Alpha Ball Joint (MPN 199-91320) is a patented, heavy-duty solution designed to address the inherent weaknesses of traditional upper ball joints in IFS (Independent Front Suspension) systems. By replacing the vulnerable rubber dust and grease boot with a durable scraper-type seal, the Alpha joint eliminates the leading cause of premature joint failure: contamination from torn or degraded boots. This design provides the durability of a traditional ball joint with the high-angle performance of a uniball.

The internals feature carburized and surface-coated alloy steel components, including a precision-fit taper pin and an oversized sphere for maximum contact surface. Unlike standard units, the Alpha joint contains no plastic liners, utilizing alloy races and machined grease paths to significantly increase pullout strength and longevity. Each joint is finished in a zinc plating for corrosion resistance and is fully greasable via a top-mounted fitting for easy maintenance.

• Patented Scraper Seal: Eliminates traditional rubber boots for superior protection (U.S. Pat. 10,731,700).
• All-Alloy Internals: Features alloy steel races and a surface-coated taper pin with no plastic liners for maximum strength.
• High-Angle Capability: Engineered to accommodate increased suspension travel in leveled or lifted vehicles.
• Greasable Design: Integrated grease fitting and internal cavity for easy periodic lubrication.
• Durable Finish: Zinc-plated housing provides excellent resistance to corrosion and environmental wear.
• Part Number: 199-91320