KYB 555055 Gas-a-Just High Pressure Monotube Gas Shock Absorber

The KYB Gas-a-Just 555055 is a high-performance monotube shock absorber designed to restore your vehicle's original handling and control capabilities. The high pressure monotube design separates the gas and oil for fade-free operation and instant response, making it ideal for sports cars, trucks, and SUVs with higher roll centers.

Advanced Monotube Technology:

• Two separate working chambers: an air-free hydraulic piston and valve area for responsiveness and control, and a second high-pressure nitrogen gas area with a floating piston
• Higher gas pressure (280 psi) keeps tires glued to the road for superior traction and control
• Separate chambers for nitrogen gas and hydraulic fluid eliminate aeration and foaming, maintaining consistent damping force in all conditions
• Instantly and automatically adjusts to performance needs without fade due to aeration

Premium Construction Features:

• Ultra-smooth triple chrome plated piston rod reduces seal wear and prevents fluid leaking
• Micro-smooth, hard-chromed pistons extend service life while seamless cylinders and eye-rings completely eliminate seam failures
• Extended length: 24.68 inches; collapsed length: 15.86 inches
• Includes all necessary washers, bushings, and nuts for installation; factory shock mounting bolts are reused

Performance Benefits:

• Up to 25% more damping over OE twin-tube designs for enhanced handling and control
• Provides a slightly firmer ride with additional control, limiting body roll and nose dive
• Works well with larger, heavier aftermarket wheels and tires
• Available as an OE monotube replacement for vehicles originally equipped with monotube shocks, or as a performance upgrade for vehicles with twin-tube shocks
• Replaces OEM part numbers: GM 15130478, 15130480, 15926834, 15926836, 25870986, 25871024

KYB recommends priming the shocks before installation by standing them upright, allowing them to fully extend, then manually compressing them—repeat this cycle 5-6 times.