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KYB Gas-A-Just Quad Shock (84-04 GT, V6, Mach 1; 94-98 Cobra)

AmericanMuscle no longer carries the KYB Gas-A-Just Quad Shock (84-04 GT, V6, Mach 1; 94-98 Cobra). Please check out 1999-2004 Ford Mustang Shocks & Struts for an updated selection.
Market Price $51.99 You Save 15% ($8.00)

$43.99 (each)

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  • Item 31013
  • MPN# KG4521

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AmericanMuscle no longer carries the KYB Gas-A-Just Quad Shock (84-04 GT, V6, Mach 1; 94-98 Cobra). Please check out 1999-2004 Ford Mustang Shocks & Struts for an updated selection.

Features & Details

  • Improves ride quality and handling
  • Mono tube design
  • Upgrade from OEM twin tube
  • Replaces stock quad shock
  • Sold Individually
  • Fits 84-04 GT, Bullitt, V6, Mach 1 and 94-98 Cobra
Upgrade From Stock. Using a heavy gauge seamless cylinder construction that resists bending, flexing, and leaking, this KYB Gas-A-Just quad shock features a floating piston that separates the oil and compresses the nitrogen gas to add velocity sensitive damping. Velocity sensitive damping allows the shock to quickly adjust to changing road conditions for greatly improved ride quality and handling.

Monotube Design. Built with advanced engineering, the KYB Gas-A-Just Rear Quad Shock features a Monotube design that completely eliminates foaming and performance fade, to provide more damping than OEM twin tube style shock absorbers for an increase in performance and stability.

Application. This KYB Gas-A-Just Rear Quad Shock is designed for use on the 1984 to 2004 Mustang, including the V6, GT, Bullitt, Mach 1 and 1994 to 1998 SVT Cobra. It does not fit the 1999 to 2004 SVT Cobra models with Independent Rear Suspension (IRS). Sold individually.

Fitment: 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Details

What's in the Box
  • (1) Rear quad shock
Installation Info
Tech Specs
Shock Specifications
Placement: Rear Quad Adjustable: No
Year: 1984-2004 Model: V6, GT, Bullitt,
Mach 1, 94-98 Cobra
Manufacture: KYB Material: Steel
Will it fit my Mustang?
  • Bullitt - 01
  • Foxbody - 84, 85, 86, 87, 88, 89, 90, 91, 92, 93
  • Mach 1 - 03, 04
  • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04
  • Cobra - 94, 95, 96, 97, 98
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04

Does not fit 1999-2004 SVT Cobra's with Independent Rear Suspension (IRS)

Most Helpful Reviews

5/5
great shock for the money

Shock is a great replacement for the stock ones mine were just stock didnt realy see improvment but they look good

Helpful (1)

5/5
Quad Shocks?

I replaced these during a suspension overhaul at 77,500 miles. This cured all axle hop problems I was having on hard acceleration. The fit was tight at the lower attachment point, using the supplied spacers, ...

Read More
Helpful (1)

Overall Rating 4.7 out of 5 stars
Read All 33 Reviews

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1 Questions / 1 Answers

Ask a Question

will these work on a 99' gt convertible?

rickmar

  • Yes they will. I installed them on my 99 coupe and they are really helped with hard launches as my old stock units were worn out. The suspension set-up is the same on the convertible, so you will be good to go.

    Racedude56

    Good Answer (0) (0)

Answer This Question I need this answered (0) (0)

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Customer Reviews (33) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Less than 1 Hour

Installation Cost:0-$100

  • Handling Improvement 4.428571 4.4
  • Ride Quality 4.703704 4.7
  • Fit 4.413793 4.4
  • Bang For Your Buck 4.344828 4.3



  • 5/5

    Installation Time: Less than 1 Hour

    April 23, 2014

    Quick install and a perfect fit

    After 25 years of service my original quad shocks were done. Not only did this pair fit perfectly (if you use the included spacer) they went installed in only a fee minutes. Took less than an hour, all in for both sides. Huge ride difference and a great deal cheaper than the OEM. another great AM part! Also made it to my house in 1 day.

    89redgt

    New York, NY, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    February 17, 2014

    Quad Shocks?

    I replaced these during a suspension overhaul at 77,500 miles. This cured all axle hop problems I was having on hard acceleration. The fit was tight at the lower attachment point, using the supplied spacers, but a couple of taps on the mounting bracket with a four pound hammer solved the problem.

    John03gtconv

    Alvin, TX, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    March 02, 2013

    great shock for the money

    Shock is a great replacement for the stock ones mine were just stock didnt realy see improvment but they look good

    dons454s

    Roaring Spring, PA 16673, USA

    Helpful (1) (0)

  • 3/5

    August 04, 2012

    Make SURE you can use quad shocks BEFORE BUYING!

    First, I'll admit that I'm new to Mustangs and made the mistake of not researching my 2004 V6's suspension requirements and parts prior to purchasing these quad shocks. I have decided to keep them as I will likely acquire and install the required hardware to utilize these quad shocks in the future. IF YOU HAVE A V6 MUSTANG, IT IS 99% LIKELY THAT YOU CANNOT INSTALL QUAD SHOCKS BECAUSE THE MOUNTING BRACKETS DID NOT COME AS A STANDARD FEATURE ON ANY V6'S. THE BRACKETS REQUIRED TO ATTACH QUAD SHOCKS ARE ONLY ON GT/COBRA/ETC. REAR ENDS. If you buy these or any other quad shocks for a V6, make SURE you have the required mounting brackets on your vehicle first. I will update my ratings as appropriate when I am able to actually install and use these shocks. Low ratings are due to the fact that NOWHERE did it specifiy the above information when i purchased them, and fitment lists a standard V6 as compatible, when it is, in fact, NOT compatible.

    blackholepcs

    Omaha, NE

    Helpful (9) (3)

  • 3/5

    Installation Time: Less than 1 Hour

    July 12, 2012

    too big...

    The stock ones have thin arms for a reason, the arms on these are too wide and rub against the shock on hard cornering. Get oem ford ones or the bilsteins or any one that has smaller arms

    StangNation666

    Central NJ

    Helpful (5) (1)

  • 5/5

    July 28, 2011

    KYB Shocks

    These shocks perform great out on the highway, high speed turns and especially no drama over speed bumps. Install was quick and easy. Installed with FRPP "B" springs, C/C Plates, Bumpsteer, and X-2 Balljoints. I'm very happy with ride comfort and control.

    Robb

    Helpful (5) (1)

  • 5/5

    June 25, 2011

    Stable Snake

    I had KYB shocks and struts all around when I bought my 1994 Cobra. I bought these quads to match my current set up. You cannot go wrong with these quads. Great price and product.

    Jeremiah Woo

    Helpful (4) (0)

  • 4/5

    Installation Time: Less than 1 Hour

    December 08, 2011

    keeping the rear inline.

    I really noticed a difference in performance from my mustang. Contrary to popular belief your quad shocks are important to your mustangs performance. I asked several people about replacing them and they all said to just replace the lower control arms with some aftermarket ones because the quad shocks were trash. Well, they were wrong because my car accelerates much better now and I believe it is a simple fix especially considering you need to have a properly located rear and your alternative is to add a torque arm like an f-body. Do yourself a favor and get these shocks.

    jay94gt

    columbus,oh

    Helpful (3) (0)

  • 5/5

    Installation Time: Afternoon

    February 07, 2012

    Smart Purchase

    These shocks added much more firmness to the rear end than I expected. After removing the factor quads (112,000 miles on them) both of them were of course completely shot. These KYBs made a big difference. I would definitly buy them again.

    MineralGreyGT

    Wilmington, NC

    Helpful (2) (0)

  • 5/5

    Installation Time: Afternoon

    January 27, 2012

    great quality

    These shocks were a must have to replace my worn out shocks. Noticeable change in the suspension. Geat buy Thankyou American Muscle.

    sterlingstang14

    sarasota florida

    Helpful (1) (0)

  • 5/5

    July 11, 2011

    kyb gas ajust shocks

    great items they made a massive difference to the handling and ride of the car and they are simple to install

    paul robo

    Helpful (1) (1)

  • 5/5

    Installation Time: Less than 1 Hour

    March 11, 2012

    Excellent Product - A must for Suspension Upgrade

    If you are upgrading or fixing you suspension don't stop at the shocks and struts, make sure you replace the quad shocks as well. You will notice the difference from your old worn out ones, these will help keep the power going to the wheels.

    Lanza

    Orlando, FL

    Helpful (0) (1)

  • 4/5

    Installation Time: Afternoon

    December 07, 2011

    Awsome Quality

    When I recieved the product they were well packaged. These new KYB shocks were an easy installation and have a great look over stock. After I installed the new shocks they performed flawlessly.

    James98svt

    Jackson, MI

    Helpful (0) (1)

  • 5/5

    Installation Time: Less than 1 Hour

    May 16, 2014

    quad shocks R necessary for the foxbody

    All the reviews that the quad shock are not needed....I beg to differ....installing upper and lower control arms, I thought that was the end to my problems. I installed KYB quad shocks that added to the rear end strength FOXBODY 91 mustang...For the price and the reliably of the shock, it was a major PLUS.... THANK U ..American mustang and KYB.. there ISN'T ANY PROBLEM, with the tire placement or shock function.... AAAAAAAAAA++++++++++++++

    bbstang91

    Philadelphia, PA, USA

    Helpful (0) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    February 26, 2014

    '91 LX Vert.

    Had a local garage install this product, however, it only took a short time and fit perfectly over the stock quad-shock. Made a big improvement on hard launches from stop and go traffic and practically removed the wheel hop from the old shocks. Would recommend this product as good upgrade over stock. Plus shipping is very fast and received in less than three days. Thanks American Muscle!

    MtnManWV

    Charleston, WV, USA

    Helpful (0) (0)

  • 5/5

    Installation Time: Afternoon

    January 08, 2014

    Not the best, but good

    These quad shocks were a huge improvement over my totally blown stock shocks (did not even push back anymore). I will say that even with the spacers clearance is a little tight because these shocks are just bigger than your stock ones. So far it has been fine though. It was hard to justify spending so much more for the skinnier quad shocks, and these seem to take care of it. Haven't noticed or heard them actually impacting my main shocks yet, though as others have said it is a tight fit.

    Brandon7733

    Helpful (0) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    December 21, 2013

    Quad Shocks really work!

    When I bought my 2001 Mustang GT the quad shocks were shot and leaking oil. I had other upgrades that I wanted to do first so I put off replacing them. Now that I have I am amazed at the difference! They really tightened up the rear end. Some people on the forums say you don't need them with aftermarket control arms but they really do work!

    Brewsky56

    Hastings, NE, USA

    Helpful (0) (0)

  • 4/5

    Installation Time: Less than 1 Hour

    October 30, 2013

    KYB shock

    Simple install and noticeable difference after I put these on my 02 gt was stiffer and for me that's a great thing it helped the rear end stick better to the ground while under load I recommend these to everyone

    Erikthegreat

    Quantico va

    Helpful (0) (0)

  • 4/5

    Installation Time: Less than 1 Hour

    September 25, 2013

    Great for a restoration where you need the quads

    A value priced option to complete a rear suspension upgrade.

    347Tony

    Philly

    Helpful (0) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    August 29, 2013

    KYB Rear Shocks

    Price was right and the install took under an hour. The previous owner installed lowering springs but fail to replace the shocks that had 100K on them. Ride is much better and no more rashness or bottoming out.

    Racedude56

    Orange, CA, USA

    Helpful (0) (0)

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