KYB 5540020 Shock Absorber - Rear

KYB Gas-a-Just Rear Shock for Ram

The KYB Gas-a-Just 5540020 is a rear monotube shock absorber built for Ram trucks that need firmer control, quicker response, and consistent damping under load. It is engineered for Ram 2500 and Ram 3500 applications where towing, heavier wheels, or air spring suspension place more demand on the rear suspension.

Gas-a-Just shocks use a high-pressure monotube design that separates gas and oil for stable operation and fast reaction to road inputs. For Ram 2500 and Ram 3500 owners looking for a rear shock upgrade, KYB Gas-a-Just 5540020 adds controlled damping without relying on a twin-tube layout.

Key Features

• Adds up to 25% more damping performance over original equipment shocks
• Monotube construction with separate gas and oil chambers for fade-resistant operation
• High-pressure nitrogen gas helps deliver immediate response and improved steering feel
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage risk
• Valving and components are tuned for Ram truck rear suspension applications
• Dust cover included
• Compressed length: 14.37 in; extended length: 23.22 in; stroke length: 8.85 in
• Lower mount type: E2(14.6X42); upper mount type: S1(12MM)

Product Details

KYB Gas-a-Just shocks are designed around a monotube layout that keeps the working gas and hydraulic fluid separated, which helps maintain consistent damping during repeated suspension movement. On Ram 2500 and Ram 3500 rear applications, that means more controlled body motion, better response over uneven pavement, and steadier performance when the truck is carrying weight or towing. Part number 5540020 is a direct-fit rear shock absorber for the listed Ram applications and is also referenced by 5540020 in catalog searches.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Excessive rear-end bounce after bumps or dips
• Reduced control when towing or hauling
• Soft or delayed shock response on heavier Ram trucks
• Suspension fade during repeated compression cycles
• Uneven ride control with larger wheels and tires

Fitment and Installation Notes

• Fits 2020-2025 Ram 2500, rear, with rear air spring suspension; Gas-a-just
• Fits 2014-2019 Ram 2500, rear, monotube performance upgrade; with rear air spring; Gas-a-just
• Fits 2007-2010 Dodge Ram 3500, rear, install a monotube shock absorber to enhance performance; Gas-a-just

Before installation, verify rear suspension configuration, mount style, and shock dimensions against the vehicle. This KYB Gas-a-just 5540020 is intended for the rear position only on the listed Ram applications.

Quality Assurance

KYB designs Gas-a-Just shocks with a monotube architecture and high-pressure gas charge to maintain consistent damping response. The triple chrome plated piston rod and application-specific valving support long-term performance in demanding truck use.