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Ford Performance Traction - LOK Rebuild Kit w/ Carbon Discs - 8.8 in. (11-14 V6; 86-14 V8, Excluding 13-14 GT500)

Item 50092
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      Review & Installation Video

      Hey guys, Stephanie with, here with this Ford Racing Traction LOK Rebuild Kit for 8.8 rears, or to break it down, 86 to 14 V8s and 2011 to 2014 V6 Mustangs. This kit from Ford Racing's going to be a good option for the guys out there with an 8.8 rear that are looking to rebuild their rear for normal maintenance, or while some new rear gears are being installed. This rebuild kit will give the stock diff an upgrade over the factory components thanks to the carbon discs. The rebuild kit is a complete kit for 31 spline axle, which is also an upgrade over the factory axels in the '05 and older cars, and that's another reason why this is going to be an upgrade over the factory components. If you're planning on, or already have some bigger power and torque numbers from your 'Stang, or the car sees track time or hard launches, a differential upgrade should be something you're looking into, and this kit offers the same results as the Ford Racing Complete Diff offers, except at a more affordable price, since this isn't a complete kit. So this rebuild kit is a kit that will get you the same results as the Ford Racing Complete Diff will, except instead of buying a completely new diff, you'd just be disassembling your diff and swapping your old components out for the items in this kit. So with that being said, a lot of the features of this kit are going to be the same as the features that the Complete Diff offers. But taking a step back, there are a couple of reasons to change or upgrade your differential. Your stock diff could be getting old and starting to chatter, and maybe it's started to fail and you aren't getting power evenly to both rear wheels. Maybe you plan on hitting the drag strip and you've got some power that you'd like to cleanly get to the ground, and you need to upgrade some components because the factory parts just aren't cutting it anymore. This rebuild kit offers a good option, because it's got a balance of building an upgraded rear diff that can handle more power and torque, but it isn't such an upgrade that it wouldn't make sense for a completely stock car to upgrade to. This diff rebuild kit will help you build the same diff that came factory in the '03 to '04 Cobras, so it will build a beefed up version of a factory style diff if you have any other Mustang besides the '03 to '04 Cobra. Like I mentioned earlier, this kit's going to come with the S-spring for 31 spline axels, so if you've got an '04 and under V8, you're looking at upgrading your axles, since those cars came with factory 28 splines. Or you can grab an S-spring for 28 spline axles instead. The choice is up to you. If you've got an '05 and up, you can reuse your factory axels with this diff, but you're still looking at an upgrade due to the fact that this diff has carbon discs. The carbon fiber discs that I keep referencing refers to the clutch pack. This kit uses the same carbon fiber clutch pack that's used in the Cobra and Shelby SVTs, and the carbon friction plates are much more durable, and they're designed for higher torque than the stock friction plates are. If we take a step back for a minute, the point of a limited slip differential, or LSD, is to allow both rear wheels to put the power to the ground, and give better traction to both rear wheels. So the thought is, if there's any type of open diff transfer, or uneven transfer of power and torque to one particular wheel over the other, it will create a useless wheel spin where the car loses its forward momentum. This rebuild kit is designed to build an LSD to eliminate that spin. It will work to transfer the torque of both wheels evenly, which will have a few benefits in both street and track applications. This means a stable, differential LOK pattern that won't fail due to the upgraded components, no slipping, more durability, gentle transitions, and even a quiet operation. This is going to work with cars with both solid axle and IRS, or cars with independent rear suspension, just as long as you have an 8.8. This kit isn't for the 7.5 rear. And one other thing to keep in mind is some of the other things that you'll need to rebuild the kit. Things like gear oil and friction modifier, and this is a great kit to add on to some new rear gears. As for price, this rebuild kit is just over $100. It's going to be a less expensive option than the entire diff is, but it will still get you the same results as a complete diff, as long as you have the know how and tools to rebuild your own rear. If you're going to be taking this to a shop for the install which you'll need some expertise for, then depending on the shop rate, I'm not so sure that this option of rebuilding the diff will save you money over just purchasing a complete diff, but that's a call that you're going to have to make for yourself. As far as the install, like I said, this is going to involve tearing apart and rebuilding the diff. It's not just a simple replacement, so you are going to need some experience for this one, or you're looking at taking it to a shop. Keeping things general here, if you want to tackle this install for yourself, you're going to need an assortment of sockets and wrenches, a couple of needle nose pliers, and you are going to need a torque wrench to do this properly. You need about four hours time, and it's a three out of three wrenches on the difficulty meter. You're going to need to get to the diff itself, so this means pulling the rear wheels, dropping the rear brake assemblies, and draining and removing the rear diff and its cover, so you'll need something to drain into. Once you have the diff uncovered, this is where the benefit of mechanical knowledge will come in. You need to remove the rear axles from the diff, the carrier will need to be removed, along with the ring gear, and the [inaudible 00:04:36]. The diff itself will need to be disassembled, and this means the gears and the clutch packs. Once everything is removed, you'll have to put it all back together of course, so your new clutch packs, the gears, the S-spring, the carrier with the shims and races, and eventually the axel C clips, and the diff cover. This is obviously a quick overview of the install, but I wanted to give you guys an idea of what it would take, so you can make a decision as to if you wish to install this yourself or take it to a shop. Wrapping things up here, the Ford Racing Traction LOK Rebuild Kit with carbon discs is to be used in 8.8 rears, and with 31 spline axels, unless you grab a different S clip. It's perfect for those guys that don't want to pick up a whole new diff, but they can rebuild their current diff instead. It's an upgrade over the factory diff components, unless you have an '03 to '04 Cobra, and in that case, it's an exact replacement. This rebuild kit is a good option for those looking for a maintenance rebuild kit, or those looking for something to make sure they get some extra torque planted squarely to the ground, and you can check it out some more online, right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Legendary Ford Racing Quality
      • Carbon Fiber Friction Plates
      • Same Parts Used in Cobras & Shelbys
      • Complete Kit
      • For 8.8" Traction-Lok Rear


      Upgrade or Replace. Whether you're rebuilding your 8.8" Traction-LOK rear or installing new gears, this kit from Ford Racing is what you need to do the job right. Make your differential perform even better than it did from the factory with this kit.

      Used In Cobras & Shelbys. Don't choose inferior parts for your rebuild - this kit features the same carbon fiber clutch pack used in the Cobra and Shelby SVT Mustangs. These plates are more durable and are designed to handle more torque than the stock ones - lasting longer and transferring power better for both stock and modified 'Stangs.

      Complete Kit For 31-Spline. This complete kit includes the clutch pack, shims, s-spring (31-spline), and an instruction sheet so you'll have everything you need.

      Technical Note: 28 spline Mustangs will require use of a 28 spline S-spring (not included).

      Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Details

      MPN# M-4700-C

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 100+ customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • January 05, 2020

        5 2007 GT - Jay Installation Time: Afternoon

        Great Grip-tion

        Had 150k miles on my Mustang and replacing ring and pinion so figured it was a good time to rebuild the posi unit too. Decided to upgrade to the Ford Performance kit with Carbon Fiber clutches. Good decision! These things grab and lock up with little throttle having a locker but without the annoying banging when cornering.

        Helpful (0)
      • September 10, 2019

        5 2020 GT500 - chad2010 Installation Time: Afternoon

        perfect fit

        works very well at track.launch straight now.No more 1 wheel spin at line.also added strange axles at same time

        Helpful (0)
      • September 06, 2019

        5 2003 GT - Jody Installation Time: Afternoon

        So far so good

        LSD clutch pack went out and I replaced it with this.

        Helpful (0)
      • August 08, 2019

        5 2003 GT - jjfehir Installation Time: Afternoon

        Great So Far

        Did the carbon fiber clutch pack when I did my 3.73 year install. Still breaking in the gears so no burnouts yet but for the first 2 days the tires were chirping at full turns in parking lots. This is most likely due to using the new s spring that came with it. Everyone says it’s impossible to use and to use the stock one but after hours of cursing and sheer force it went in, had to shave the c clips down to fit if you use the new spring but I’m excited for how well it will work.

        Helpful (2)
      • July 25, 2019

        5 2000 GT - MarkJ Installation Time: Less than 1 Hour


        It's an upgrade you must have. Notice a much more solid launch.

        Helpful (0)
      • May 20, 2019

        5 2001 GT - DakotaL Installation Time: Less than 1 Hour

        Great product!

        Soak the discs in a friction modifier before you put them in! Product works like it’s supposed to!

        Helpful (1)
      • April 23, 2019

        5 2013 GT - ChaseG Installation Time: Afternoon

        Great stuff

        Love this upgrade on my 13 Gt. Much smoother of a ride now that I got new clutches in.

        Helpful (0)
      • March 19, 2019

        3 2012 GT - TonyR666 Installation Time: Shop Install

        Future install

        Have not installed yet took about six days to get to me will update once installed

        Helpful (0)
      • March 10, 2019

        5 2012 GT500 - Pops Installation Time: Shop Install Installation Cost: $250-$500

        The beast

        My rear was getting bad when turning after I had the clutches in the diff..I notice the driffrence and more power on the go..

        Helpful (2)
      • March 08, 2019

        5 2007 GT - Lurch904 Installation Time: Full Day

        Carbon clutch packs

        Make sure you pick up some friction modifier to soak them in . The install is a 5 outa 5 but they work well. High quality better than stock

        Helpful (1)

      Questions & Answers (26 answers)

      5 Top Rated Questions

      I don't want to upgrade my axles for my Mustang but I want to do a rebuild for my differential. Where could I find the 28 spline clip

      • Unfortunately, we do not carry the 28 Spline clip.

      Helpful (5)

      can you use this kit on a 97 cobra 4.6 4v dohc, i think that it has a 28 spline rear end, but can you use the kit and then use the original s clip thats in the dif or will it not work with this kit

      • The Ford Performance Traction - LOK Rebuild Kit can be used in a 97 Cobra, however a 28 Spline S Spring is required. A new one, or the existing can be reused, however we recommend sourcing a new unit to ensure the tension is correct.

      Helpful (4)

      Do I need any other parts for this to fit on a 05 GT rear end? Not sure if my car has the 31-spline axels?

      • Your stock car does come with 31 spline axles, and if you are just rebuilding the rear end this is all that would be needed.

      Helpful (4)

      i have 28 spline axles in my car and other than having to reuse my old spring will this rebuild kit work for the 28 spline rear ends

      • This will work with your 28 spline axles.

      Helpful (1)

      I was told that if im changing my gears which i am to 410 that i would need to by this kit also or a positive traction differential especially that i have a foxbody mustang i just want to make sure i get what i need to have ca trouble free upgrade.i would appreciate the professional advice on what all i realy need to complete this job correct thznk you

      • The Ford Performance Traction - LOK Rebuild Kit is not required when replacing the gears, however if you are experiencing issues with the stock Traction - LOK differential, such as uneven burnouts/one wheel peels, it may be time to rebuild the differential with this kit or a similar kit. We would recommend consulting with your installer to see the additional labor costs of rebuilding the differential, plus the cost of this kit and compare it to the cost of replacing the differential (it comes out during the gear install, so it should not require any additional labor charges). This will be the best way to decide between a new Differential, or rebuilding the existing unit, as labor costs vary greatly.

      Helpful (1)
      10 More Questions
      Does this kit work with an automatic transmission? 1 answer
      I have a 99 GT im pretty sure it has the 28 spline but if I use this kit does it allow me to upgrade to the 31 spline or will I need a whole new LSD? 1 answer
      I am going to be installing these in my mustang, it has 3.73 gears, will the S spring clear the ring gear? Hoping to avoid removing the carrier. While I'm in there going to replace the spider gears as well. Thank you. 0 answer
      Is this part included on the 3.73 Gear kit? 1 answer
      I’m replacing my rear axles and diff in my 2012 5.0 Gt should I get this along with the axle and rear diff and do it when I do them? 1 answer
      Ok guys I'm confused. This kit says its for a 11-14 V6 8.8 rears. But, when I get ready to order it it pops up a statement saying it will not fit my mustang. I have a 2011 V6 DUB EDITION 8.8 3.31 gears. NOW what is it? It fits or It doesn't? 1 answer
      why does this kit exclude 13-14 GT 500s ? Ford has told me that they use the same kit as everyone else, your help would be appreciated 1 answer
      I have a 2014 mustang v6 that I've owned for a year now and it has 50,000 miles on it and I want to order new 3.73 gears and installation kit for it. Do I need to order the rebuild kit also or is just the new gear kit fine? 1 answer
      What gear oil do these carbon discs like synthetic or conventional? 1 answer
      If I put these in my factory Traction Lok with 28 spline axles will I be able to use the 31 spline s clip and put in 31 spline axles without any other modification? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • Carbon Fiber Clutch Pack
      • Shims
      • (1) S-spring (31 spline)
      • (1) Cross Pin Bolt
      • Instruction sheet

      Tech Specs


      • Fits all 8.8" Traction-Lok differentials
      • Kit includes:
        • Carbon Fiber Clutch Pack
        • Shims
        • S-spring (31 spline)
        • Instruction sheet

      Will It Fit My Mustang

      • Boss 302 - 12, 13
      • Bullitt - 01, 08, 09
      • Cobra - 93, 94, 95, 96, 97, 98, 99, 00, 01, 03, 04
      • Cobra R - 93, 95, 00
      • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
      • GT500 - 07, 08, 09, 10, 11, 12
      • LX - 87, 88, 89, 90, 91, 92, 93
      • Mach 1 - 03, 04
      • Other - 86
      • V6 - 11, 12, 13, 14

      Not compatible with Mustangs equipped with a 7.5" rear end

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