Smooth out a working truck's ride with the KYB shock absorber, part number 5540020 — a High Pressure Monotube Gas Shock that installs as a direct-fit rear damper for the 2007-2010 Dodge Ram 3500 and 2014-2025 Ram 2500 (see the Buyer's Guide tab for engine-level fitment). This KYB Gas-a-just monotube design separates the gas and oil into two working chambers for fade-free operation and instant response — an air-free hydraulic piston and valve area for control, plus a high-pressure nitrogen gas chamber with a floating piston that keeps normal driving comfortable.
- Monotube advantage: The high-pressure design won't experience fade due to aeration and responds quickly to help improve steering response.
- Built for Rams: Components and valving designed specifically for Rams, adding up to 25% more damping performance over original equipment shocks — extra damping over OE for vehicles that work, tow, and run larger, heavier tires and wheels.
- Durable rod: An ultra-smooth triple chrome plated piston rod reduces seal wear, since fluid leaking can be a cause of shock failure.
KYB Gas-a-just also helps keep the vehicle's Electronic Safety Systems performing as designed, since they depend on the suspension, brakes and tires operating as the manufacturer intended.
Interchange: 5189389AC · 5189389AD · 68233895AC · 68233906AD · 68245526AA
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicles does the KYB gas shock absorber 5540020 fit?
It is a rear shock for the 2007-2010 Dodge Ram 3500 and 2014-2025 Ram 2500. Check the Buyer's Guide tab to confirm the engine and configuration for your vehicle.
Is this a monotube or twin-tube shock?
It's a KYB Gas-a-just high-pressure monotube gas shock. The design separates the gas and oil into two chambers for fade-free operation and instant response.
How much damping does the KYB Gas-a-just monotube add?
KYB states the Gas-a-just adds up to 25% more damping performance over original equipment shocks, with valving designed specifically for Rams.
Does this shock help my truck's safety systems?
KYB notes that Electronic Safety Systems depend on the suspension, brakes and tires working as intended, and the Gas-a-just helps keep those systems performing as designed.
Should I replace both rear shocks together?
This listing is for one shock, sold individually. Replacing both sides as a matched pair is recommended for even, balanced ride control.
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