GMC Sierra 1500 AT4 Upper Control Arm Kit - Front - Cognito - Billet, Delta Joint, Adjustable - 2019–2026. A precision upper arm upgrade engineered to correct geometry and expand alignment range on AT4 trucks.

Machined from 6061 billet aluminum, these UCAs balance light weight with high strength and added clearance. The ICON Delta Joint delivers high-angle motion for full bump and droop with reduced bind, while PTFE-lined 7/8 in. FK rod ends provide crisp steering feedback and on-vehicle camber/caster adjustment. Includes vehicle-specific taper pins, sealed dust caps, and all hardware for a complete install. Fitment notes: AT4 with coil front springs; compatible with 0–1.5 in. front lift. Not for AT4X. Pickup models with Adaptive Ride Control require aftermarket front and rear shocks and Cognito part numbers 71021 and 71022. Trimming of UCA stops may be needed to maximize downtravel.

Features

• CNC machined 6061 billet aluminum construction
• ICON Delta Joint high-angle ball joint (U.S. Patent No. 10,731,700)
• PTFE-lined 7/8 in. FK rod ends; adjustable camber and caster
• Vehicle-specific taper pin; OE-like fit
• O-ring sealed dust cap; includes complete hardware

Have questions or planning a build? Call our Austin, Texas team at 512-982-9393 or our Los Angeles, California area shop at 562-981-6800. We offer professional installation and customization at both locations.

Buying 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