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Steeda IRS Differential Bushing Insert System - Urethane (15-17 GT)

Market Price $111.99 You Save 11% ($12.04)
Our Price

$99.95

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  • Item 390071
  • MPN# 555-4439

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Features & Details

  • Steeda IRS Urethane Bushing Kit
  • Limit IRS Differential Movement
  • Improves Traction and Reduces Wheel Hop
  • No Increase in NVH (Noise, Vibration, Harshness)
  • Street - Red 80 Durometer Urethane Bushings
  • Performance - Black 90 Durometer Urethane Bushings
  • No Permanent Modifications Required for Installation
  • Designed and Manufactured in the USA
  • Fits All 2015 to 2017 GT Mustangs
Limit IRS Differential Movement. If you like to drive your GT Mustang aggressively on the street or at auto cross events you may find the factory Independent Rear Suspension is in need of a little extra help. It is know that the IRS differential of the 2015 to 2017 Mustang's is notorious for moving under acceleration, hard braking and even during spirited driving. This excessive movement can cause a laundry list of handling and traction problems, including differential deflection and wheel hop. However, by upgrading to a Steeda IRS Differential Urethane Bushing System you can considerably limit the movement of your S550 Mustang's IRS to improve traction and handling performance.

Street and Performance. Steeda engineered their IRS Differential Urethane Bushing Insert System with Street and Performance drivers in mind. This Steeda IRS Bushing Kit includes two different options. The red 80 durometer bushings are for the Street use. While the black 90 durometer bushings are intended for Performance driving. As an added bonus these 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 two different durometer bushings as your driving needs change.

Application. The Steeda IRS Differential Urethane Bushing Insert System is specifically designed for use on 2015 to 2017 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 Details

What's in the Box
  • (4) Red Street 80 Durometer Urethane Bushings
  • (4) Black Performance 90 Durometer Urethane 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?
  • GT - 16, 15, 17

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Most Helpful Reviews

5/5
Suspension upgrade

Bushings fit perfectly. On a 2017, install is a headache for the front bushings. Leave one rear subframe bolt in but very loose, take the other 3 completely out while supporting subframe on a floor jack. ...

Read More
Helpful (1)

5/5
Wheel hop gone (combined with vertical links)

I installed these and BMR vertical links at the same time while changing my exhaust. (you really need to remove exhaust to make install easier so this is a good upgrade to do at the same time if you upgrade ...

Read More
Helpful (1)

Overall Rating 4.3 out of 5 stars
Read All 14 Reviews

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Customer Reviews (14) Write a Review

Overall Rating 4.3

out of 5 stars

Installation Time:Afternoon

Installation Cost:$100-$250

  • Handling Improvement 4.166667 4.2
  • Fit 4.666667 4.7
  • Bang For Your Buck 4.25 4.3



  • 5/5

    March 09, 2017

    Suspension upgrade

    Bushings fit perfectly. On a 2017, install is a headache for the front bushings. Leave one rear subframe bolt in but very loose, take the other 3 completely out while supporting subframe on a floor jack. Subframe can then be pivoted and wiggled around enough to get a wrench in. Alternate rear subframe bolts and repeat process for the other side. This is the only way it can be done. Just go with the black bushings because you're not going to want to do this twice. I'm not sure what all the complaints about NVH are all about with the black bushings on a street car. The whole point of suspension upgrades is to take the slop out. A Mustang is a muscle car. If you want quiet comfort, get a Lincoln Town Car. These, combined with the rest of the Steeda suspension parts, make the car feel like it gained 50 HP now that the power isn't twisting the rear.

    Gman

    Year: 2017 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    February 06, 2017

    Wheel hop gone (combined with vertical links)

    I installed these and BMR vertical links at the same time while changing my exhaust. (you really need to remove exhaust to make install easier so this is a good upgrade to do at the same time if you upgrade exhaust). Had a shop install looked like it took them about 40 min (with the exhaust already off) Between these and the new Vertical links my wheel hop is almost gone or at least reduced to the point I don't notice it. I paid for 3.5 hours of labor (100 per hr) to have exhaust, Vert links, and these installed all at same time. (bill sheet was 1 hr for me but if you were doing these alone I would expect to get charge 1.5 hours as they will probably pull exhaust and then reinstall)

    Eman

    Year: 2016 Submodel: GT

    Helpful (1)

  • 3/5

    Installation Time: Afternoon

    November 23, 2016

    Pretty good

    I have a 2015 Gt 50th anniversary performance pack. I notice a difference in the rear, stiffened up a little bit. THE from differential bushings would not fit in place though.

    Tbook

    Year: 2015 Submodel: GT

    Helpful (1)

  • 3/5

    Installation Time: Afternoon

    November 17, 2016

    Not what I expected

    Installed the black bushings first (2016 GT performance pack 6 speed) along with the Steeda IRS bushing support system. Wheel hop definitely reduced but it was not gone. Still very noticeable on the drag strip. Amplified all sorts of new noises. Horrible vibration noise when letting off the throttle above 40 mph. Only got louder at higher speeds. Odd deep grrr sound when doing a sharp turn at low speeds. So I swapped to red bushings and removed steeda irs support bushings. Installed red. Noises reduced. More wheel hop ofcourse but still reduced overall. Overall the car shifts much better. It used to have a loud thump if I'd swap gears too quickly before I installed bushings. That's the only reason I'm leaving them in at all. I think the noises were just existing noises being amplified and I will have them looked at. Still only 3 stars because I still clearly have wheel hop. (Other mods: Steeda subframe braces and vertical links)

    Stang16

    Year: 2016 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    November 04, 2016

    Stop the hop

    I was back an forth between using the red and black ones I take it to the track. But decided to put in the red ones anyway. Pleased to say the hop is gone and I can't hear any diffrence. I left it lose 1st threw 3rd. No more hopping feeling like the car is going to break. To be fair I did install the subframe bushings and lowing springs at the same time. It's a 2017 but won't give me the option 4 that below.

    Rob

    Year: 2016 Submodel: GT

    Helpful (1)

  • 5/5

    August 16, 2016

    Help Stop the Hop

    As always American Muscle was fantastic with its customer service, and crazy fast shipping! Steeda quality is unmatched and worth the price! I installed the red inserts because my mustang is my daily driver and the difference is huge it truly does help stop the wheel hop, really nice fitment as well. Install is a little tricky and I would absolutely recommend having help! Besides that 5 out of 5.

    Burge

    Year: 2016 Submodel: GT

    Helpful (1)

  • 4/5

    Installation Time: Less than 1 Hour

    May 18, 2016

    Better control

    These bushing definately firm up the rear. My wheel hop has been drastically reduced. Easy to install, took me 20 minutes on the hoist.

    Dsandahl

    Year: 2015 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    May 04, 2016

    Helps with wheel-hop

    It was pretty easy to install and does help with wheel-hop. The car still feels stock and the roads are pretty rough where I live.

    Vrooom

    Year: 2016 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    July 22, 2017

    Great product!

    Knocked wheel hop down by about 40. Going to add the subframe bushings next week. No extra nvm.

    MichaelZ

    Year: 2016 Submodel: GT

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    July 20, 2017

    reduces wheel hop.

    Easy to install product. Works as indicated. Reduces wheel hop! This is a must have.

    B4rk3r

    Year: 2016 Submodel: GT

    Helpful (0)

  • 3/5

    Installation Time: Shop Install

    June 11, 2017

    Good but not great

    I'm using the black diff inserts. Installed at the same time as Steeda RLCA bearings. Car feels noticeably more willing to pounce. I take off for it because it comes at a price. These inserts have made the transmission for clunky, particularly on downshifts. I've been told by Steeda this is normal. Product works but not with NVH increases. I could take it or leave it but leaving them for now at least. All in all the noise doesn't bother me that much.

    Bluemustang87

    Year: 2015 Submodel: GT

    Helpful (0)

  • 3/5

    Installation Time: Afternoon

    April 11, 2017

    Increase in noise

    I installed the RED on my 17' GT Manual trans. There is a lot more noise after installation, specifically drivetrain slack is amplified.

    FrankT

    Year: 2017 Submodel: GT

    Helpful (0)

  • 5/5

    August 04, 2016

    This fixed the hop!

    I have several Steeda parts on my car but this is what really stopped all the hop in the IRS. I used the firmer of the two bushings. It does allow for some nvh to be transmitted into the car but for me its a livable exchange.

    Cobra99Dave

    Year: 2016 Submodel: GT

    Helpful (0)

  • 4/5

    Installation Time: Afternoon

    June 02, 2016

    Reduced wheel hop with a catch.

    I installed these with the Steeda subframe bushing support rings and both hav greatly reduced wheel hop. However the rear differential is a bit louder in the car while driving at highway speeds; I used the softer red bushing supports. Install was a true pain in the butt with a jack and jack stands but it can be done. You need to remove the exhaust to install these. Fit finish and quality are great!

    Everitt

    Year: 2015 Submodel: GT

    Helpful (0)

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