Steeda S550 Mustang Adjustable Differential Bushing Insert System - Urethane (15-17 GT)

Steeda S550 Mustang Adjustable Differential Bushing Insert System - Urethane (15-17 GT)


555 4439

Steeda Autosports has once again taken the S550 Mustang to the next level of performance and comfort with our exclusive Adjustable Urethane Differential Mount Bushing Insert System for all 2015-2016 Mustang GT! When our engineers sat down to design this kit, we had to come up with a way to increase performance without sacrificing an ounce of drivability all while keeping the car quiet!

Unlike our competitors' kits that will absolutely increase NVH (noise, vibration, harshness), take 3-4 hours to install and force you to permanently modify the rear IRS suspension with a sawzall, Steeda's does not! Steeda's kit installs in under 1 hour, adds little to no increase in NVH, is adjustable and can be easily removed - it simply doesn't get any better than this!

Minimize pinion angle changes, increase traction, eliminate wheel hop and differential deflection with Steeda's new kit. Made from high-strength urethane to Steeda's exact specifications and durometers, our kit comes with 2 different bushing options - our red 'street' 80 durometer bushings and our black 'performance' 90 durometer bushings. Both bushing options will increase performance with no increase in NVH, a Steeda-exclusive.

Steeda's kit adds the strength and support the OEM bushings need to perform the way our customers intended. Once again, this is not a permanent modification - there is no drilling, cutting or pressing required. Simply loosen and remove a couple bolts and this kit installs in less than 1 hour. Bushings are included for both the front and rear differential mounting locations. Grade 10.9 hardware is included with zinc-plated washers.

Note: For hardcore enthusiasts that want ZERO pinion deflection, try our 555 4440 kit. This kit features aluminum bushing inserts. For race-use only as it will increase NVH and gear noise.

Product Benefits

  • Limits IRS differential movement while increasing traction and eliminating wheel hop
  • Little to no increase in NVH unlike the competition
  • Easily removable, not a permanent modification
  • 100% designed, manufactured and made in the USA
  • Installs in 1 hour or less

Purchase the Steeda S550 Mustang Adjustable Urethane Differential Mount Bushing Insert System for your 2015-2017 Mustang GT from Steeda Autosports today!

I have virtually zero hop
I went with the red differential inserts. There is just the slightest noise coming from the rear at certain speeds, I think around 60-65mph. With the music going, you cannot hear it or if you have an exhaust, you won't hear it either. They did work to reduce wheel hop as advertised. With all the mods I have now out back, I have virtually zero hop. When hitting 2nd gear, the car just spins and spins straight. Very control and no chatter or hop. It brought a smile to my face the first time I banged second. Keep in mind, it has been cold down south and not seeing hop is a great thing. It means when it is warm, this sucker is just gonna grip and go.
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Reviewed by:  from Georgia. on 10/10/2016
First time the car hooked up for me without bouncing everywhere
Steeda diff bushings were the biggest surprise. I have the subframe mounts on back order, so I will get them in next week. But I was amazed at the difference the bushings made. Only a slight wheel hop on wet roads. First time the car hooked up for me without bouncing everywhere. Used the red bushings, no noticeable NVH especially with the new exhaust. Can't wait to see how it does with the subframe mounts.
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Reviewed by:  from Mississippi. on 7/9/2016
The difference is night and day
Hey guys I just recently installed the the Steeda IRS & Differential bushings (red bushings) along with the IRS alignment kit. All I have to say is WOW! I installed it myself in the garage. It was very straightforward and easy. The difference is night and day. The car would have some really bad exaggerated wheel hop. I didn't feel much confidence with the car on launch and handling. I almost started to question my driving skills. On handling you get a lot of the control back. The car becomes more predictable when the rear breaks loose. When launching, it dips and rips off the line with very minimal wheel hop to where the car can grip. It's a very very good confident feeling you get. The wheel hop I would say is about 95% gone. The 5% wheel hop that you do feel is very light and almost unnoticeable. Anyone who is in doubt or questioning on getting the kit, I highly recommend it and it's worth every single penny. You won't regret it!
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Reviewed by:  from Florida. on 5/10/2016
This is the way the car should be with the PP
Since I was going to have the car up on jack stands in my driveway, I figured I'd do just about everything at once. Installed the Steeda IRS subframe bushing supports, alignment inserts, differential bushing supports(black), transmission bushing insert, and the Steeda shifter base bushing bracket along with the FR touring cat back. I had to have the upgraded bushing in the knuckle done at the Ford dealer. The bounce is gone! This is the way the car should be with the PP.
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Reviewed by:  from Michigan. on 4/8/2016
The car feels so much more planted to the road
This is the first time I've ever done anything suspension wise to my car, David @ Steeda helped out greatly with all my questions as well as getting me setup with an install at their Pompano location with a tour of some badass shop cars and their facility. Everyone @ Steeda - David, Patrick, Matt were great and made sure I was happy with everything. I can't recommend their shop enough to anyone in the area and Matt did an awesome job with everything on the install, even tack welded my Gibson exhaust and turned their clamps a bit to help out. I won't have a chance to do pics this weekend of my spot on the beach as that will give a good before/after comparison when I put them together. The car feels so much more planted to the road, even just turning out of their parking lot I could tell everything felt more connected and precise to what I was telling the car to do. It basically now goes where I want it instead of reacting to what I'm asking it to do if that makes any sense at all? I had some open highway and did a little bit of careful back and forth in my lane and I felt completely planted and not bouncing around back and forth in my seat. Almost found myself doing slalom in between some construction barrels but given how my morning went I decided against it. The springs give the car the look I wanted and make the Vossen wheels look that much better. Nice tighter rebound than stock PP springs and reduces the overall bouncy ness on some of those highway stretches where it feels like you're hitting hydraulics for a half a mile. Also any bridges or overpasses with rough spots where you enter/leave them were solid. The MT-82 bushing insert is noticeable and I had much easier downshifts for highway passes on the way home, feels like a much more solid shift that I had to get a bit used to in a good way. I didn't do any hard launches or try to break the rear end loose at all since I was just getting used to it, will report back later on that. I can't really report on some of the individual IRS components since they all went in at the same time, but I am noticing a slight (and I mean slight) gear wine from the rear with the Black bushings. It's only really noticeable if you try to make it happen and barely push the gas at cruising speed. Nothing I'm worried about and after 4 hours of driving it home windows down and up for a few sprinkles it does not bother at me all. It's not all the time either or in any specific gear so no biggie as far as I'm concerned.
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Reviewed by:  from Florida. on 3/27/2016
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