Cognito Uniball Pin & Hardware Kit | 1999-2020 GM Trucks & SUVs OE Cast Steel UCAs

The Obsidian Vision

For GMT800 and K2XX GM trucks and SUVs originally equipped with OE cast steel upper control arms, the Cognito HP9227 Uniball Pin and Hardware Kit is the precision service component engineered to maintain the geometry correction and droop travel gains delivered by a Cognito uniball upper control arm installation — keeping the outboard joint operating at specification through the full suspension travel arc across nearly two decades of GM half-ton platform evolution. Cognito machines this pin to the exact dimensional tolerances required by their cast-steel-arm uniball assembly, ensuring proper bearing seat engagement, correct preload, and full angular range without the joint slop or binding that results from substituting non-spec hardware in a corrected-geometry application. Built to the same quality standards as Cognito's full arm assemblies, the HP9227 is the correct service solution for preserving the ride quality, steering precision, and long-term durability of the original Cognito arm investment on 1999–2020 GM trucks and SUVs.

Concierge Fitment Guarantee

Every order is manually reviewed by our technicians to ensure 100% compatibility with your build before we ship.

Engineering Breakdown

• Restores factory-spec uniball preload and angular operating range in Cognito uniball upper control arms designed for OE cast steel arm applications, preventing the joint slop and steering vagueness that develop when uniball hardware wears beyond service tolerance.
• Eliminates the dimensional mismatch and accelerated wear caused by substituting non-Cognito hardware — pin diameter, thread pitch, and bearing seat geometry on the HP9227 are specific to Cognito's cast-steel-arm uniball assembly and differ from the HP9159 aluminum/stamped steel arm variant.
• Maintains the corrected uniball angle and increased droop travel engineered into the original Cognito arm installation, ensuring the full suspension system continues to perform as designed across the GMT800 and K2XX GM platform range through 2020.

The HP9227 uniball pin is machined to the dimensional tolerances specific to Cognito's uniball joint assembly for vehicles originally equipped with OE cast steel upper control arms — a distinct specification from the HP9159 kit designed for aluminum and stamped steel OEM arm applications. Pin diameter, thread engagement length, and bearing interface geometry are all proprietary to Cognito's design and are not interchangeable with OEM or third-party hardware. The included mounting hardware is grade-matched to Cognito's torque specifications, ensuring proper clamp load on the uniball housing without risk of thread galling or under-torque joint movement. This kit spans the GMT800 platform (1999–2006 Silverado/Sierra 1500 trucks and 2000–2006 SUVs), the GMT900 and K2XX platforms (2007–2018 Silverado/Sierra 1500 with OE cast steel UCAs), and the full-size SUV carryover through 2020 — making it the correct single service part for Cognito's cast-steel-arm uniball applications across the broadest range of GM half-ton builds.

Audit Table

Verified Fitment (OFAS Standard)

✅ CONFIRMED — GMT800 Half-Ton Trucks:
1999–2006 GMC Sierra 1500 2WD/4WD (SL, SLE, SLT, Denali, WT, HT, C3, Hybrid)
2000–2006 Chevrolet Silverado 1500 2WD/4WD (LS, LT, WT, SS, Z71, Hybrid)

✅ CONFIRMED — GMT800 Full-Size SUVs:
2000–2006 Chevrolet Tahoe / Suburban 1500 2WD/4WD
2000–2006 GMC Yukon / Yukon XL 1500 2WD/4WD

✅ CONFIRMED — GMT900 / K2XX Half-Ton Trucks with OE Cast Steel UCAs:
2007–2018 Chevrolet Silverado 1500 2WD/4WD (WT, LS, LT, LTZ, High Country, Custom, SSV, XFE, Hybrid, Z71, Midnight Edition)
2007–2018 GMC Sierra 1500 2WD/4WD (SL, SLE, SLT, Denali, WT, XFE, Denali Hybrid)
2019 Chevrolet Silverado 1500 LD 2WD/4WD (WT, LT, Custom)

✅ CONFIRMED — GMT900 / K2XX Full-Size SUVs:
2007–2020 Chevrolet Tahoe (LS, LT, LTZ, Z71, Premier, PPV, SSV, Hybrid, Midnight Edition)
2007–2014 Chevrolet Suburban 1500 (Base, LS, LT, LTZ, Z71)
2015–2020 Chevrolet Suburban (LS, LT, LTZ, Premier, HD)
2007–2014 GMC Yukon XL 1500 (SLE, SLT, Denali)
2015–2020 GMC Yukon XL (SLE, SLT, Denali)
2007–2020 GMC Yukon (Base, SLE, SLT, Denali, Hybrid, Denali Hybrid)

❌ REQUIREMENTS:
Requires OE cast steel upper control arm configuration — vehicles originally equipped with aluminum or stamped steel OEM UCAs require the HP9159 kit, which has a different pin specification.
Requires existing Cognito uniball upper control arm installation — this is a service/replacement part specific to Cognito's proprietary uniball joint assembly and is not compatible with OEM arms or other aftermarket brands.
Requires torque-to-spec installation per Cognito's service documentation — do not substitute hardware or deviate from specified torque values.

Installation & Technical Notes

Estimated Install Time: Under 1 hour with basic hand tools and a floor jack
Alignment Required: Not required for pin replacement alone if suspension geometry has not been disturbed; recommended if any control arm mounting hardware was loosened during service.
Torque Specifications: Refer to Cognito's service documentation for the HP9227 pin torque spec — torque with the suspension loaded at ride height to prevent bushing wind-up.
Service Interval: Inspect uniball pin and hardware for wear, corrosion, or joint slop at every alignment service or any time steering vagueness or clunking is detected from the front suspension.
Platform Note: If unsure whether your vehicle has OE cast steel or aluminum/stamped steel UCAs, verify by inspecting the factory upper arm material before ordering. Cast steel arms are heavier and have a distinctly different appearance from the thinner-walled aluminum or stamped steel OEM arms found on later K2XX builds.

Wheel & Tire Fitment

This is a service hardware kit — wheel and tire fitment is determined by the Cognito upper control arm assembly already installed on the vehicle. Refer to the original arm kit's fitment documentation for tire size, wheel backspacing, and offset specifications applicable to your platform and lift height.

Our team is standing by to verify your OE arm material (cast steel vs. aluminum/stamped steel) and confirm HP9227 is the correct pin kit for your specific build. Purchase with confidence; we review every build.