KYB 554351 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Tacoma

The KYB Gas-a-just 554351 is a rear suspension shock absorber built for 2005-2015 Toyota Tacoma applications. This monotube design is tuned for drivers who want firmer control, quicker response, and consistent damping in daily use, towing, and heavier-duty setups.

For Toyota Tacoma rear shock replacement, the Gas-a-just line adds performance-focused valving and a high-pressure gas design that separates oil and gas for stable operation. The result is direct response, reduced fade, and improved steering feel when the suspension is working harder than stock.

Key Features

• Adds up to 25% more damping performance over original equipment shocks
• Designed specifically for Toyota Tacoma rear applications
• Monotube construction provides additional damping for work trucks, towing, and larger tires and wheels
• High-pressure gas and oil separation supports fade-free operation and quick response
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Higher gas pressure improves steering response and suspension control
• Dust cover included

Product Details

KYB Gas-a-just shocks use two working chambers: an air-free hydraulic section for responsiveness and control, and a high-pressure nitrogen chamber with a floating piston for ride comfort and immediate performance demand. Part number 554351 measures 12.4 inches compressed, 19.33 inches extended, and 6.93 inches of stroke, with lower mount type E2(12X32) and upper mount type S1. This part cross-references Monroe Shocks & Struts (e.g., 37279) for the same application.

Common Issues This Shock Can Address

• Excessive rear bounce or oscillation on rough roads
• Reduced control when towing or carrying heavier loads
• Soft or delayed shock response compared with OE damping
• Suspension fade during repeated compression and rebound cycles
• Steering feel that has become less precise as shocks wear

Installation Notes and Tips

Fits 2005-2015 Toyota Tacoma, rear. Confirm mount style, compressed length, and extended length before installation to match the vehicle’s suspension travel. Inspect related suspension components, tire condition, and mounting points during replacement to help restore consistent ride control. Part number 554351 should be matched to the rear position only for the listed Tacoma applications.

Quality Assurance

KYB is a long-established suspension supplier, and the Gas-a-just line is engineered with monotube construction and high-pressure gas separation for consistent damping performance. The design also supports the operation of vehicle safety systems by helping the suspension respond as intended.