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KYB Suspension 553390 Gas-a-Just Monotube Performance Shock Absorber

(2010-2013 Mazda 3 Mazdaspeed)

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

Other options in this family: KYB Suspension 551108 KYB Suspension KG4605A KYB Suspension 551119 KYB Suspension KG4503 KYB Suspension 551122

Manufacturer

Picture for manufacturer KYB Suspension

Part Number

553390
8 reviews
Sale Price

$84.14

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The KYB Gas-a-Just 553390 is a high-pressure monotube gas shock absorber engineered to deliver superior performance and fade-free operation. Unlike traditional twin-tube designs, this monotube shock features a unique two-chamber system that provides both responsive handling and exceptional ride comfort.

Advanced Monotube Design Benefits:

  • Instantly adapts to changing road conditions and driving demands
  • Eliminates performance fade caused by aeration and fluid foaming
  • Larger piston diameter for improved damping efficiency
  • Enhanced heat dissipation through the outer tube body

Dual-Chamber Technology:

  • Air-free hydraulic chamber with precision piston and valving for immediate response and superior control
  • High-pressure nitrogen gas chamber with floating piston separator for consistent damping performance
  • Nitrogen pressurization maintains tire contact with the road surface

The Gas-a-Just can be used as a direct replacement for OE monotube shocks or as a performance upgrade over factory twin-tube units. This shock absorber provides a comfortable ride during everyday driving while delivering enhanced handling and stability when performance is needed.

Products specifications

Fits

2010-2013 Mazda 3 Mazdaspeed

FEATURE AND BENEFIT 1

ADDS UP TO 25% MORE DAMPING PERFORMANCE OVER ORIGINAL EQUIPMENT SHOCKS

Compressed Length

19.48

Extended Length

28.34

Stroke Length

8.86

Feature and Benefit 2

COMPONENTS AND VALVING DESIGNED SPECIFICALLY FOR THE MAZDA 3 MAZDASPEED

Lower Mount Type

E2(12X36)

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 INCLUDE ADDITIONAL DAMPING OVER OE DESIGN 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: SB125

Upper Mount Type

S1(8MM)

Feature and Benefit 6

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

Feature and Benefit 8

TO REDUCE THE CHANCE OF NOISE AND VIBRATION KYB RECOMMENDS INSTALLING NEW SHOCK MOUNT COMPONENTS, PART NUMBER: SM5619

R-stop

Y

Internal Rebound Spring

N

Easy buying experience. Great prices. Excellent shipping times.

Any website, product in stock.

Great I could not find this pump anywhere

Happy so far

easy, quick, direct!

Very good

Good And Quick

Autoplicity has an abundance of name brand parts at unbeatable prices. Customer service was also great to deal with. Receipt and tracking info was provided promptly.

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