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KYB Suspension 551129 Gas-a-Just Monotube Gas Shock Absorber

(2007-2011 Lexus GS350; 2006 Lexus GS300)

Manufacturer

Picture for manufacturer KYB Suspension

Part Number

551129
17 reviews
Sale Price

$102.76

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The KYB Gas-a-Just 551129 is a high-pressure monotube gas shock absorber designed to restore and enhance your vehicle's suspension performance. This premium shock features KYB's advanced monotube design that delivers superior responsiveness and handling compared to standard twin-tube shocks.

Key Features:

  • Monotube design with two separate working chambers for optimal performance
  • Air-free hydraulic piston and valve area provides immediate response and precise control
  • High-pressure nitrogen gas chamber with floating piston ensures consistent damping
  • Delivers comfortable ride quality during normal driving conditions
  • Instant performance enhancement during aggressive driving and cornering
  • Larger piston surface area improves heat dissipation and reduces fade
  • Direct OE monotube replacement for vehicles originally equipped with monotube shocks

The Gas-a-Just monotube design separates the hydraulic fluid from the nitrogen gas using a floating piston, eliminating air-oil mixing and maintaining consistent damping performance. This configuration provides firmer control than standard replacements while maintaining ride comfort, making it ideal for drivers seeking improved handling without sacrificing daily drivability.

Products specifications

Fits

2007-2011 Lexus GS350; 2006 Lexus GS300

Upper Mount Type

12X1.25

Compressed Length

13.45

Extended Length

16.94

Stroke Length

3.49

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

Internal Rebound Spring

INTERNAL REBOUND SPRING

Dust Cover Included

N

B-stop

N

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 THE LEXUS GS

Feature and Benefit 8

TO REDUCE THE CHANCE OF NOISE AND VIBRATION KYB RECOMMENDS INSTALLING NEW STRUT MOUNTS, PART NUMBER: SM5738

R-stop

Y

Internal Rebound Spring

Y

excellent prices

Shopping went well. Good price.

Perfect Fit just what I needed received earlier than expected

It was very good

Easy deal.

Fast shipping and best price on my performance gaskets. Thanks!

Great service overall good exidience highly recommended

Would have preferred the parts shipped together but very please with the price and products delivered.

UNFORTUNATELY PART DID NOT FIT MY APPLICATION SO WILL RETURN

Very easy to find what I was looking for and was done within just a few minutes. Thanks

Best price..

Really easy process(:

Great so far

Easy

Very pleasant.

Great prices and quick shipping.

It was fast and easy.

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