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KYB KG5555 Gas-a-Just High-Pressure Monotube Shock Absorber

(Buick Century 1982-96, Skylark 1980-85; Oldsmobile Silhouette 1990-96, Cutlass Ciera 1982-96, Omega 1980-84, Cutlass Cruiser 1987-94 + 7 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

KG5555
11 reviews
Sale Price

$26.74

Estimated ship date Monday, November 23

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Product Details

The KYB KG5555 Gas-a-Just is a high-pressure monotube shock absorber engineered to deliver superior handling, stability, and fade-free performance compared to traditional twin-tube designs. Sold individually, this rear shock is purpose-built for classic GM cars and trucks that demand more from their suspension.

At its core, the Gas-a-Just features two separate working chambers: an air-free hydraulic piston and valve section for precise responsiveness and control, paired with a high-pressure nitrogen gas chamber separated by a floating piston. This design eliminates aeration and foaming entirely, ensuring consistent damping force and instant response under any driving condition.

Key Features:

  • High-pressure monotube design separates gas and oil for fade-free operation and instant response
  • Delivers up to 25% more damping performance over original equipment shock absorbers
  • Floating piston eliminates aeration and foaming for consistent, fade-free performance
  • Automatically adjusts damping force to changing road conditions for enhanced control
  • Micro-smooth, hard-chromed piston reduces wear and extends service life
  • Seamless cylinder and eye-ring construction eliminates seam failures for long-term durability
  • Components and valving specifically designed for classic GM passenger cars
  • Additional damping capacity supports vehicles that tow, haul, or run larger/heavier wheels and tires
  • Suitable for a wide range of applications including passenger cars, trucks, and motorhomes/RVs
  • Backed by a lifetime warranty for the original retail purchaser

Extended Length: 21.06 in. | Compressed Length: 14.17 in. | Stroke Length: 6.89 in. | Lower Mount: E2 (10x40) | Upper Mount: S1 | Position: Rear

The KYB Gas-a-Just KG5555 is the performance-minded choice for drivers seeking a durable, responsive monotube shock that restores and exceeds original suspension performance.

Products specifications

Fits

Buick Century 1982-96, Skylark 1980-85; Oldsmobile Silhouette 1990-96, Cutlass Ciera 1982-96, Omega 1980-84, Cutlass Cruiser 1987-94; Chevrolet Celebrity 1982-90, Lumina APV 1990-96, Citation 1980-83, Citation II 1984-85 + 3 more models

FEATURE AND BENEFIT 1

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

Compressed Length

14.17

Extended Length

21.06

Stroke Length

6.89

Feature and Benefit 2

COMPONENTS AND VALVING DESIGNED SPECIFICALLY FOR CLASSIC GM CARS

Lower Mount Type

E2(10X40)

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

R-stop

N

Upper Mount Type

S1

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 STRUT MOUNTS, PART NUMBER: SM5010

Dust Cover Included

Y

B-stop

Y

Internal Rebound Spring

N

Ordering was easy and product arrived in a reasonable amount of time. No complaints with respect to order and delivery. Although, note my comment regarding product packaging. I ordered two each like Fram Air Filters. Both filters arrived in their original boxes, which were both placed into a single larger box for shipping. Upon arrival, the Fram boxes were severely damaged as if someone had been using them as footballs. Fortunately, the air filters within were not physically damaged. The company who shipped this order to me needs to do a better job of packaging and/or use heavier boxes to prevent damage of content.

The Ranch Hand grille guard is nice and very solid. It was delivered fast and very well packaged. Would definitely shop with them again.

Just fine again.

good

First time to shop here and it went well. If received as expected will be back. Thanks, Bill

Surprised at the speed of delivery. I will be a return customer.

very satisfied

They had the lowest price by far! Quick shipment! I am going back for more. Thanks!<br><br>Order 6489

Awesome

Finally I found the part I have searched all over for. Thank you autoplicity for having such a specialized part. Great customer service too. Very easy to use web site as well.

I purchased a wiring connector and some additional wiring pins. Super fast shipping. Likely to buy from again.

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