KYB 554378 Shock Absorber - Rear

KYB Gas-a-Just Rear Shock Absorber

The KYB Gas-a-just 554378 is a monotube rear shock absorber built for GM SUVs that need firmer control, quicker response, and consistent damping. It is a direct-fit suspension shock absorber for rear applications on the Buick Enclave, Chevrolet Traverse, GMC Acadia, GMC Acadia Limited, and Saturn Outlook.

Key Features

• Monotube design separates gas and oil for fade-resistant operation and fast response.
• Delivers up to 25% more damping performance than original equipment shocks.
• Higher gas pressure improves steering response and body control.
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage.
• Valving and components are tuned specifically for GM SUVs.
• Built for vehicles that tow, work, or run larger tires and wheels.
• Dust cover included.

Product Details

KYB Gas-a-just shocks use two working chambers: an air-free hydraulic section for control and a high-pressure nitrogen gas section with a floating piston for ride comfort and immediate performance when conditions change. That design helps maintain consistent damping on rear suspension setups where load, road input, and vehicle weight can vary. Part number 554378 is a strong OE-style upgrade for drivers who want more precise rear suspension control without changing the vehicle’s basic ride height or suspension layout.

This part cross-references Monroe Shocks & Struts 37315 for the same application.

What It Helps Address

• Rear-end bounce or excessive oscillation after bumps
• Reduced control when towing or carrying heavier loads
• Soft or delayed rear suspension response
• Fluid leakage related to worn shock seals
• Loss of damping consistency from aeration or heat buildup

Installation Notes

Fits 2008-2017 Buick Enclave, rear. Fits 2009-2017 Chevrolet Traverse, rear. Fits 2017 GMC Acadia Limited, rear. Fits 2007-2016 GMC Acadia, rear. Fits 2007-2010 Saturn Outlook, rear. Verify compressed length, extended length, stroke length, and upper/lower mount types before installation. This shock uses E2(14.2X43) lower mount and E2(12.2X95.5) upper mount. Rear suspension components should be inspected for worn bushings, mounts, and hardware before replacing the shock absorber.

Quality Assurance

KYB is known for OE-level suspension engineering, and the Gas-a-just line is built with monotube construction and high-pressure gas charging for consistent damping performance. Part number 554378 is designed to meet the demands of GM SUV rear suspension service.