Rancho RS77379 Suspension Shock Absorber - Rear

Rancho RS7MT Rear Shock for HD Trucks

The Rancho RS7MT monotube shock absorber is built for rear suspension control on heavy-duty Chevrolet Silverado and GMC Sierra trucks. Part number RS77379 is application tuned for on-road stability and off-road handling, with heat dissipation that supports demanding use on larger wheel and tire setups.

Key Features

• Monotube shock design for efficient heat dissipation
• Integrated dirt wiper sealing system helps keep debris out of the shock body
• Hardened piston rod resists scuffs and corrosion
• Internal rebound bumper helps smooth suspension movement over uneven terrain
• Loop bushing and sleeve upper and lower mounts, LS47
• 2-inch reserve tube diameter with 9.06 inches of travel
• Extended length: 25.83 inches; compressed length: 16.77 inches

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. This rear shock absorber is engineered for Chevrolet Silverado 1500, Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 1500, Sierra 2500 HD, and Sierra 3500 HD applications listed below. The RS77379 uses a monotube construction to manage heat more effectively than many twin-tube designs, helping maintain consistent performance during extended driving or rough terrain. This part cross-references KYB 554389 for the same application.

Vehicle Fitment

• Fits 2021-2025 Chevrolet Silverado 2500 HD, rear.
• Fits 2021-2025 Chevrolet Silverado 3500 HD, rear.
• Fits 2021-2025 GMC Sierra 2500 HD, rear.
• Fits 2021-2025 GMC Sierra 3500 HD, rear.
• Fits 2011-2020 Chevrolet Silverado 2500 HD, rear; rear shock absorber for 0 inch raised height.
• Fits 2011-2020 Chevrolet Silverado 3500 HD, rear; rear shock absorber for 0 inch raised height.
• Fits 2011-2020 GMC Sierra 2500 HD, rear; rear shock absorber for 0 inch raised height.
• Fits 2011-2020 GMC Sierra 3500 HD, rear; rear shock absorber for 0 inch raised height.
• Fits 2014-2016 Chevrolet Silverado 1500, rear.
• Fits 2014-2016 GMC Sierra 1500, rear.

Common Issues This Shock Can Address

• Excessive rear-end bounce on rough roads
• Reduced control when towing or carrying heavy loads
• Heat-related damping fade during extended driving
• Premature wear from dirt, dust, and road debris
• Harsh rear suspension response over uneven pavement or trail surfaces

Installation Notes

Verify rear fitment by year, model, and suspension configuration before installation. This shock uses LS47 loop bushing and sleeve mounts at both ends, so confirm the sleeve dimensions match the vehicle mounting points. Check compressed and extended lengths against the existing suspension travel to ensure proper clearance at full droop and compression. For 2011-2020 Silverado HD and Sierra HD applications, confirm the 0 inch raised height note before ordering.

Quality Assurance

Rancho RS7MT shocks are built with a dirt wiper sealing system, a hardened piston rod, and an internal rebound bumper to support consistent operation in demanding truck applications. RS77379 is engineered for rear suspension service on the listed Chevrolet Silverado and GMC Sierra models.