Rancho RS77378 Suspension Shock Absorber - Front

Rancho RS7MT Front Shock for Heavy-Duty Trucks

The Rancho RS7MT RS77378 is a front suspension shock absorber built for precision on-road control and off-road stability. It is application tuned for Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD models, including lifted front applications on 2011-2020 trucks with 1.0 to 2.5 inches of front raised height.

Key Features

• Monotube shock design for efficient heat dissipation during demanding use
• Integrated dirt wiper sealing system helps keep dirt and debris out of the shock body
• Hardened piston rod resists scuffs and corrosion
• Internal rebound bumper helps smooth suspension movement over changing terrain
• Reserve tube diameter: 2 inches
• Extended length: 18.82 inches; compressed length: 14.69 inches; travel length: 4.13 inches
• Lower mount: clevis bracket mount; upper mount: XP15

Product Details

Rancho RS7MT shocks are part of the RS7MT line, which focuses on controlled damping for trucks that see both pavement and trail use. The RS77378 front shock absorber is engineered for heavy-duty Chevrolet Silverado HD and GMC Sierra HD platforms, including 2021-2025 Silverado 2500 HD, Silverado 3500 HD, Sierra 2500 HD, and Sierra 3500 HD front applications, plus 2011-2020 front applications with a 1.0 to 2.5 inch raised height. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Excessive front-end bounce on rough roads
• Reduced control after suspension lift changes
• Heat buildup during extended off-road driving
• Dirt intrusion that can shorten shock life
• Corrosion and rod wear from harsh driving conditions

Installation Notes and Fitment

Fits 2021-2025 Chevrolet Silverado 2500 HD, front. Fits 2021-2025 Chevrolet Silverado 3500 HD, front. Fits 2021-2025 GMC Sierra 2500 HD, front. Fits 2021-2025 GMC Sierra 3500 HD, front. Fits 2011-2020 Chevrolet Silverado 2500 HD, front, with front raised height 1.0 in to 2.5 in. Fits 2011-2020 Chevrolet Silverado 3500 HD, front, with front raised height 1.0 in to 2.5 in. Fits 2011-2020 GMC Sierra 2500 HD, front, with front raised height 1.0 in to 2.5 in. Fits 2011-2020 GMC Sierra 3500 HD, front, with front raised height 1.0 in to 2.5 in.

Verify mount style, ride height, and suspension configuration before installation. The RS77378 uses a clevis bracket lower mount and XP15 upper mount, so matching the existing hardware layout is important for proper fitment.

Quality Assurance

Built by Rancho for HD truck use, the RS7MT platform combines monotube construction, sealed dirt protection, and a hardened piston rod for consistent performance in demanding conditions. Part number RS77378 is specified for the listed Chevrolet Silverado HD and GMC Sierra HD front applications.