KYB 565038 Shock Absorber - Rear

KYB MonoMax Rear Shock for Heavy-Duty Trucks

The KYB MonoMax 565038 is a rear suspension shock absorber built for trucks that carry weight, tow, or see rough road use. Its monotube design and large bore construction are aimed at improving control on heavier GM applications, including Chevrolet P30, C20, C30, and GMC P3500 rear suspension setups.

Key Features

• Heavy-duty monotube shock absorber for rear suspension use
• Up to 40% more damping performance than standard shock absorbers
• Large bore design for added stability on higher center-of-gravity vehicles
• Zinc-coated stainless steel piston ring for a positive seal in severe conditions
• Rubber dust boot helps protect the shaft and keep dirt away from the seals
• Fade-resistant performance that adjusts to changing driving conditions

Product Details

KYB MonoMax is the brand’s truck-focused shock line, built for demanding rear suspension applications where load control matters. Part number 565038 uses a monotube design to improve handling response and durability compared with standard twin-tube shocks. With a compressed length of 14.53 inches, extended length of 22.6 inches, and 8.07 inches of stroke, it is sized for the listed GM rear applications and supports consistent damping under work and off-road conditions. This part cross-references Monroe Shocks & Struts (e.g., 34960) for the same application.

Used For

• Rear-end bounce or instability on loaded trucks
• Reduced control when towing a trailer
• Excess body movement on rough pavement or jobsite use
• Suspension fade during repeated heavy-duty driving
• Improving rear shock response on older GM truck platforms

Installation Notes and Fitment

Fits 1975-1999 Chevrolet P30, rear, except motorhome chassis; Fits 1979-1999 GMC P3500, rear; Fits 1993-1996 Chevrolet G30, rear, except motorhome chassis, heavy duty chassis; Fits 1993-1996 GMC G3500, rear, with heavy duty chassis; Fits 1989-1991 Chevrolet R3500, rear; Fits 1987-1991 GMC R3500, rear; Fits 1982-1989 Chevrolet P20, rear; Fits 1982-1989 GMC P2500, rear; Fits 1987-1989 GMC R2500, rear; Fits 1987-1988 Chevrolet R20, rear; Fits 1987-1988 Chevrolet R30, rear; Fits 1975-1986 Chevrolet C20, rear; Fits 1975-1986 Chevrolet C30, rear; Fits 1979-1986 GMC C2500, rear; Fits 1979-1986 GMC C3500, rear; Fits 1975-1980 Chevrolet P10, rear; Fits 1979-1980 GMC P1500, rear.

Verify compressed length, extended length, and mount style before installation. The upper mount type is E2(14.6X41) and the lower mount type is E2(14.6X42). Dust cover is included. Part number 565038 is a direct-fit rear shock for the listed Chevrolet and GMC applications.

Quality Assurance

KYB builds the MonoMax line for demanding truck use with a monotube construction, sealed piston ring, and protective dust boot to support durability in severe service. The design is focused on stable damping and consistent control for rear suspension applications on older Chevrolet and GMC trucks.