Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $5,000 For Your Mustang! Enter daily!

Steeda IRS Differential Bushing Insert System - Street to Full Race Combo Kit (15-19 GT)

AmericanMuscle no longer carries the Steeda IRS Differential Bushing Insert System - Street to Full Race Combo Kit (15-19 GT). Please check out 2015-2019 Mustang Limited Slip Differentials for an updated selection.
This item currently can not be added to your cart. Please try again later.

Features & Details

  • Steeda Street to Full Race IRS Bushing Kit
  • Limits IRS Differential Movement
  • Improves Traction and Reduces Wheel Hop
  • Urethane Bushings - No Increase in NVH (Noise, Vibration, Harshness)
  • Aluminum Bushings - Intended for Drag Strip Use
  • Includes Red Urethane, Black Urethane and Billet Aluminum Bushings
  • No Permanent Modifications Required for Installation
  • Designed and Manufactured in the USA
  • Fits All 2015 to 2019 GT Mustangs
Limit IRS Differential Movement. Do you feel that your S550 Mustang's traction and handling performance is just not up to par? Well you're absolutely right, the Independent Rear Suspension of the 2015-2019 Mustang's is well known for moving under acceleration, hard braking and even spirited driving. This IRS movement can cause a host of handling and traction issues, including wheel hop. However, by upgrading to a Steeda Street to Race IRS Differential Bushing System you can significantly limit the movement of your Mustang's IRS to improve the handling performance of your S550 Mustang.

Street, Performance, Race. Steeda engineered their IRS Differential Bushing Insert System with all drivers in mind, including Street, Performance and Race. This Steeda IRS Bushing Kit includes three different options. The red 80 durometer bushings are for the Street. The black 90 durometer bushings are for Performance driving. While the billet 6061 aluminum bushings are intended for Drag Race use. As an added bonus the urethane bushings will not increase the NVH (noise, vibration, harshness) of your ride.

Straight Forward Installation. The Steeda IRS Differential Bushing Insert System is designed to install with just basic hand tools in under an hour. No extra modifications or special tools are needed for a straight forward installation. Seeing that no permanent modifications are required you can switch between the three different durometer bushings as your driving needs change.

Application. The Steeda Differential Bushing Insert System is specifically designed for use on 2015 to 2019 GT Mustangs that are equipped with the factory Independent Rear Suspension (IRS). Not for use on V6 or EcoBoost models.

Note: Coupon codes cannot be applied to this product.

Fitment: 2015 2016 2017 2018 2019 Details

MPN# 555-4442

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (4) Red Street 80 Durometer Urethane Bushings
  • (4) Black Performance 90 Durometer Urethane Bushings
  • (4) Aluminum Race Bushings
  • (2) 110mm Bolts
  • (2) 65mm Bolts
  • (2) 35mm Bolts
  • (2) Front IRS Bushing Spacers
  • (2) Rear IRS Bushing Spacers
  • (4) Large Washers
  • (2) Small Washers
Installation Info
Tech Specs
Will it fit my Mustang?

You Might Also Like

Customer Photos

More Products You Might Like

Questions & Answers (1)

1 Top Rated Question

Do these fit with aftermarket suspension components

  • Hello! No, the Steeda IRS Differential Bushing Insert System is only designed to work with the factory suspension components.

Helpful (0)
Post Your Question

Customer Reviews (4) Write a Review

Overall Rating 3.8

out of 5 stars

Installation Time:Afternoon

  • Handling Improvement 3.333333 3.3
  • Fit 3.666667 3.7
  • Bang For Your Buck 3.333333 3.3

  • 5/5

    Installation Time: Afternoon

    November 08, 2017

    Putting the power to the ground

    Fairly easy install, almost torqued the front short bolts to 130 lbs in, which would been a disaster. Thank goodness I read the instructions again.One of my ingredients to eliminate axle hop. Nice upgrade little more NVH but very much acceptable.


    Year: 2016 Submodel: GT

    Helpful (5)

  • 4/5

    May 04, 2017

    Fixing wheel hop

    First, I have a 2016 Premium PP. I went with the RED IRS Bushings. While it didn't completely take away wheel hop, I feel like it made a big improvement. I felt the most improvement when making a turn and hitting the gas a little while running over uneasy pavement where the car felt a lot firmer and more planted. There is still a lot of room for improvement, but again I still have the black and the aluminum bushings if I was that concerned. If your a weekend warrior like me and don't have all that many tools, you should check to see if you have an 18MM socket and wrench. Do not assume your socket kit comes with one. This took me a couple hours in my garage to do, but I think it was well worth it. The Steeda instructions are a tiny bit vague, but you can always fall back to youtube.


    Year: 2016 Submodel: GT

    Helpful (5)

  • 1/5

    Installation Time: Afternoon

    April 07, 2017

    Not happy

    The kit came with bolts I used the bolt followed the steps drove the car for six weeks no problems got on the car today had the two rear bolts break differential dropped and cut the boots on both axles may have done driveshaft damage not sure yet so I'm not very happy with this product and the cheap bolts now I'm looking at two axles and a lot of work sucks when you buy a upgrade and it don't hold up


    Year: 2017 Submodel: GT

    Helpful (6)

  • 5/5

    September 24, 2016

    Steeda IRS

    Encrease handling. Bether power transfer. Make little noise and vibration


    Year: 2016 Submodel: GT

    Helpful (6)

Related Mustang Categories