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KYB Suspension 551121 Gas-a-Just Monotube High Pressure Gas Shock Absorber

(Chevrolet Silverado 1500 2007-13, Suburban 1500 2007-14, Tahoe 2007-14, Avalanche 2007-13; GMC Yukon XL 1500 2007-14, Sierra 1500 2007-13 + 4 more models)

Part of: KYB Suspension Gas-a-Just Monotube High Pressure Gas Shock Absorber

Other options in this family: KYB Suspension KG54317 KYB Suspension KG5462 KYB Suspension KG4752 KYB Suspension 554348 KYB Suspension KG5440

Manufacturer

Picture for manufacturer KYB Suspension

Part Number

551121
4 reviews
Sale Price

$130.24

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The KYB Gas-a-Just 551121 is a high-performance monotube gas shock absorber designed to deliver superior handling and fade-free performance. Unlike traditional twin-tube shocks, this monotube design provides instant automatic adjustment to changing road conditions and driving demands without experiencing performance fade due to aeration.

Key Features:

  • Monotube design for improved heat dissipation and consistent performance
  • Dual-chamber construction with separate hydraulic and gas chambers
  • Air-free hydraulic piston and valve area ensures responsive control
  • High-pressure nitrogen gas chamber with floating piston for instant performance
  • Fade-free operation even under demanding conditions
  • Comfortable ride quality during normal driving with on-demand performance
  • Available as direct OE monotube replacement or performance upgrade for twin-tube applications

The Gas-a-Just design separates the hydraulic fluid from the nitrogen gas using a floating piston, eliminating aeration and maintaining optimal damping characteristics. This configuration allows the shock to automatically adapt to your driving style, providing comfort during daily commuting and firm control when performance is needed.

Products specifications

Fits

Chevrolet Silverado 1500 2007-13, Suburban 1500 2007-14, Tahoe 2007-14, Avalanche 2007-13; GMC Yukon XL 1500 2007-14, Sierra 1500 2007-13, Yukon 2007-14; Cadillac Escalade 2008-14, Escalade ESV 2008-14, Escalade EXT 2008-13

Upper Mount Type

10X1.25

Compressed Length

13.26

Extended Length

17.71

Stroke Length

4.45

Lower Mount Type

E3(100X128X10)

Feature and Benefit 7

ELECTRONIC SAFETY SYSTEMS DEPEND ON THE SUSPENSION, BRAKES AND TIRES OPERATING AS THE VEHICLE MANUFACTURER INTENDED. THE KYB GAS-A-JUST HELPS KEEP ELECTRONIC SAFETY SYSTEMS PERFORMING AS DESIGNED.

Feature and Benefit 5

FLUID LEAKING CAN BE A CAUSE OF SHOCK FAILURE, THE KYB GAS-A-JUST HAS AN ULTRA-SMOOTH TRIPLE CHROME PLATED CHROME PISTON ROD TO REDUCE SEAL WEAR

Feature and Benefit 3

GAS-A-JUST MONOTUBES ARE DESIGNED FOR VEHICLES THAT WORK, TOW, AND HAVE LARGER, HEAVIER TIRES & WHEELS

Feature and Benefit 4

HIGH PRESSURE MONOTUBE DESIGN SEPARATES THE GAS AND OIL FOR FADE FREE OPERATION AND INSTANT RESPONSE

Dust Cover Included

N

B-stop

N

Feature and Benefit 9

PROTECT YOUR NEW STRUTS FROM DIRT, DEBRIS AND SALT WITH A KYB STRUT BOOT, PART NUMBER: SB129

FEATURE AND BENEFIT 1

THE CORRECT, MONOTUBE-DESIGNED OEM REPLACEMENT

Feature and Benefit 6

THE HIGHER GAS PRESSURE OF THE KYB GAS-A-JUST RESPONDS QUICKLY TO IMPROVE STEERING RESPONSE

Feature and Benefit 2

THE KYB GAS-A-JUST HELPS RESTORE THE DESIGNED CONTROL AND HANDLING OF FULL-SIZE GM TRUCKS

Feature and Benefit 8

TO REDUCE THE CHANCE OF NOISE AND VIBRATION KYB RECOMMENDS INSTALLING NEW STRUT MOUNTS, PART NUMBER: SM5530

R-stop

Y

Internal Rebound Spring

N

Great pricing. (Check on google and they were the cheapest and had great reviews.) Quick shipment and everything is as they said it would be.

I would like expected shipping date

Best price I could find anywhere and it shipped right away!

great stuff cheap price. fast shipping

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