GMC Sierra 1500 Ball Joints - Upper - Cognito Alpha (1999–2018). Patented upper joints built for hard-use IFS with durable, high-angle operation and no fragile dust boots.

The Alpha’s scraper-style bootless seal shrugs off tears and contamination. Pre-greased yet serviceable via a top fitting for periodic lube and flushing. Alloy steel internals—no plastic liner—pair with a carburized, coated taper pin and oversized sphere for broad contact, strength, and long wear. Zinc-plated housing and in-vehicle rebuild capability add practical longevity. Delivers the positive feel of a uni-ball with the durability of a heavy-duty ball joint and greater pullout strength than plastic-lined designs.

Features

• Patented design (U.S. Pat. 10,731,700)
• Greasable top fitting; internal grease cavity
• Alloy steel races; no plastic liner
• Carburized, coated taper pin; oversized sphere
• High-angle travel; corrosion-resistant housing

Questions or planning a setup? Call our team—installation and customization available at our Austin, Texas and Los Angeles, California area shops: TX 512-982-9393, CA 562-981-6800.

If you’re purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov