Keep every rear corner planted and controlled with the KYB Gas-a-just Suspension Shock Absorber (MPN 554378), a high-pressure monotube gas shock for the rear position. It fits the 2008-2017 Buick Enclave, 2009-2017 Chevrolet Traverse, 2007-2016 GMC Acadia, 2017 GMC Acadia Limited, and 2007-2010 Saturn Outlook — see the Buyer's Guide tab for engine-level detail.
The Gas-a-just monotube design separates the gas and oil for fade-free operation and instant response, avoiding the aeration that can affect a traditional twin-tube shock. It uses two working chambers: an air-free hydraulic piston and valve area for responsiveness and control, plus a high-pressure nitrogen gas area with a floating piston for a comfortable ride during normal driving with added performance on demand.
- Triple chrome-plated piston rod: an ultra-smooth rod helps reduce seal wear, since fluid leaking can be a cause of shock failure.
- Higher gas pressure: designed to respond quickly to improve steering response.
- Up to 25% more damping: adds damping over original-equipment shocks, with components and valving designed specifically for GM SUVs that work, tow, and run larger, heavier tires and wheels.
- Supports safety systems: helps keep electronic safety systems performing as designed by maintaining intended suspension operation.
Interchange: 20757505 · 23147603 · 25822946 · 25838254 · 20832849 · 22937121 · 22937122 · 23147604 · 25822945 · 25978183 · 25978185 · 25995532 · 15232945 · 20862317 · G64040 · 37315
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What position does this shock fit?
It is a rear suspension shock absorber for the listed applications. Shocks work as a pair, so replacing both rear units together is recommended for balanced ride control.
How is a monotube different from a twin-tube shock?
The Gas-a-just monotube separates the gas and oil in one tube for fade-free operation and instant response, avoiding the aeration that can affect a traditional twin-tube design.
What does the high-pressure nitrogen gas do?
A high-pressure nitrogen chamber with a floating piston provides a comfortable ride during normal driving and adds performance on demand, while the higher gas pressure is designed to improve steering response.
Why does it have a triple chrome-plated piston rod?
Fluid leaking can be a cause of shock failure. The ultra-smooth triple chrome-plated rod helps reduce seal wear over time.
Which vehicles does MPN 554378 fit?
The 2008-2017 Buick Enclave, 2009-2017 Chevrolet Traverse, 2007-2016 GMC Acadia, 2017 GMC Acadia Limited, and 2007-2010 Saturn Outlook. Check the Buyer's Guide tab to confirm your vehicle.
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