KYB 5550025 Gas-a-Just Rear Shock for 19-21 Chevy Silverado 1500/GMC Sierra 1500

Vehicle Fitment

• 2019-2021 Chevrolet Silverado 1500 (Z85 Increased Capacity models, Rear) - All trims listed
• 2019-2021 GMC Sierra 1500 (Z85 Increased Capacity models, Rear) - All trims listed
• Fitment confirmed through 2021 for listed models. Coverage for 2022+ unconfirmed at time of listing.

Features

• High-pressure Gas-a-Just monotube design for improved damping control
• Direct OEM-style replacement for rear shock absorber on Z85 full-size GM trucks
• Maintains factory ride height - no engineered lift or drop
• Dual-chamber construction: hydraulic piston plus nitrogen gas chamber to eliminate aeration/fade
• Heavy-duty seamless steel body and chrome-plated piston rod for longer life
• Multi-lip synthetic oil seal with debris wiper to protect internal components under tough conditions
• Improves rear-end stability, reduces sag under load and enhances ride control while towing or hauling
• Recommended to replace in pairs for balanced suspension performance across the rear axle

Specifications

• Position: Rear shock absorber (driver or passenger side) - qty 1 per unit
• Product Line: Gas-a-Just Monotube by KYB
• Ride Height Change: 0 in - designed to maintain stock geometry and clearance
• Construction: Steel seamless cylinder, chrome piston rod, nitrogen gas chamber
• Mounting: Factory rear shock mount configuration for 2019-21 Silverado/Sierra 1500 Z85
• Material: Heavy-duty steel body with corrosion-resistant finish for demanding truck use

Included Components

• 1x KYB 5550025 Rear Monotube Shock Absorber
• 1x Hardware bag (nuts/bolts/washers) - contents may vary by packaging region

Product Description

The KYB 5550025 Gas-a-Just rear shock absorber is engineered specifically for the 2019-2021 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks equipped with the Z85 Increased Capacity package. Built with a high-pressure monotube design, it significantly improves damping performance, especially under load, increasing ride control, stability, and responsiveness over standard twin-tube units.

Because this shock maintains factory ride height (0 inch lift/drop), you preserve your truck's original geometry and clearance while gaining upgraded suspension control. It's ideal for owners who tow, haul, or drive aggressively but still demand OEM-style fitment and durability. Replacing both rear shocks simultaneously is strongly recommended to ensure matched performance across the axle.

Please note: Fitment is confirmed for model years 2019 through 2021 for the specified Silverado/Sierra Z85 models. Coverage for later years (2022 and beyond) is unconfirmed at time of listing. Always verify the exact build specification, bed length, payload package, and Z85 designation before installation to ensure compatibility.