KYB KG54325 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for GM Vans

The KYB Gas-a-just KG54325 is a rear suspension shock absorber built for GM vans and crossover applications that need firmer control than a standard twin-tube design. It is a monotube shock that separates gas and oil for quick response, consistent damping, and reduced fade during demanding driving.

Compatible With 1997-2009 Pontiac Montana, Chevrolet Uplander, Buick Terraza, Saturn Relay, Oldsmobile Silhouette, and Pontiac Trans Sport rear suspension applications, this KYB Gas-a-just rear shock is a direct performance-focused upgrade for vehicles that tow, carry loads, or run larger wheels and tires.

• Monotube design with separate gas and hydraulic chambers for responsive damping
• Up to 25% more damping performance over original equipment shocks
• High-pressure nitrogen charge helps maintain fade-free operation
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Improved steering response from higher gas pressure and quicker shock reaction
• Built for GM SUV and van suspension tuning
• Dust cover included

Gas-a-just Product Line Details

KYB Gas-a-just shocks are designed for drivers who want more control than OE-style twin-tube units can provide. The monotube layout uses an air-free hydraulic working area for precision and a separate high-pressure gas chamber for immediate force when suspension demand increases. That makes the KG54325 a practical choice for rear suspension service on GM platforms where stability and control matter.

This part cross-references Monroe Shocks & Struts 37156 for the same application.

Common Problems This Shock Can Address

• Excessive rear bounce after bumps or dips
• Reduced control when carrying passengers or cargo
• Shock fade during repeated suspension movement
• Loose or delayed steering response from worn rear damping
• Uneven ride quality on vehicles with heavier tires and wheels

Installation Notes and Fitment Tips

Fits 1999-2009 Pontiac Montana, rear; 2005-2008 Chevrolet Uplander, rear; 2005-2007 Buick Terraza, rear; 2005-2007 Saturn Relay, rear; 1997-2004 Oldsmobile Silhouette, rear; and 1997-1998 Pontiac Trans Sport, rear. Verify that your vehicle does not use self-leveling rear suspension or rear level control where noted in the fitment data. Confirm compressed length 12.8, extended length 19.84, stroke length 7.05, and upper/lower mount type E2(12X38) before installation. Professional installation and a post-repair alignment check are recommended whenever suspension components are replaced.

Quality Assurance

KYB is known for OE-focused suspension engineering, and the Gas-a-just line uses a high-pressure monotube design to deliver consistent damping and reduced aeration-related fade. The KG54325 is built to meet the demands of GM rear suspension applications that require stable control and predictable response.