KYB 5550006 Suspension Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Ram 3500

The KYB Gas-a-just 5550006 is a rear monotube shock absorber built for 2014-2018 Ram 3500 models with rear air spring suspension. It is engineered for drivers who need firmer control, quicker response, and consistent damping in demanding towing and work conditions.

Gas-a-just shocks use a high-pressure monotube design that separates gas and oil for fade-resistant operation. For Ram 3500 applications, the valving and components are tuned for heavier loads, larger wheels and tires, and improved steering response.

Key Features

• Fits 2014-2018 Ram 3500, rear
• Monotube design with separate gas and oil chambers for consistent damping
• Up to 25% more damping performance over original equipment shocks
• Designed specifically for Ram 3500 applications
• High-pressure nitrogen gas helps deliver instant response during load changes
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Dust cover included
• Compatible with electronic safety systems that rely on suspension performance

Product Details

KYB Gas-a-just 5550006 is part of the Gas-a-just line, a performance-focused shock absorber series that uses a monotube layout for faster heat dissipation and more stable damping than a traditional twin-tube design. The internal floating piston keeps the gas and hydraulic fluid separated, which helps maintain control under repeated suspension movement. This rear shock is a direct-fit option for Ram 3500 trucks equipped with rear air spring suspension and is suited to vehicles that work, tow, or run heavier tire and wheel packages.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application. The KYB 5550006 is also referenced by OE numbers 68236645AC, 68236645AD, 68236648AD, and 68236649AD.

What It Helps Address

• Excessive rear bounce after bumps or load changes
• Reduced control when towing or carrying heavy cargo
• Shock fade from repeated suspension heat buildup
• Slow steering response caused by worn rear damping
• Fluid leakage related to seal wear on aging shocks

Installation Notes

Fits 2014-2018 Ram 3500, rear. Verify rear air spring suspension and mount dimensions before installation. Compressed length is 19.37 inches, extended length is 25.82 inches, and stroke length is 6.45 inches. Upper and lower mount type are E2 (14.6 x 42). Dust cover is included; internal rebound spring and B-stop are not included.

Quality Assurance

KYB designs Gas-a-just shocks with a monotube construction and high-pressure gas charge to maintain damping consistency under demanding use. The triple chrome plated piston rod is used to help reduce seal wear and support long-term sealing performance.