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Ford Performance Traction-LOK Limited Slip Differential w/ Carbon Discs - 31 Spline 8.8 in. (11-14 V6; 86-14 V8, Excluding 13-14 GT500)

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  • Item 24062
  • MPN# M-4204-F318C

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    Features, Video & Details

    • Put the Power to the Pavement
    • Assembled 8.8" Limited Slip Differential
    • Includes Carbon Discs
    • Heavy Duty
    • Requires 31 Spline Axles
    • Fits 1986-2014 V8 and 2011-2014 V6

    Review & Installation Video

    Review & Install Video

    Hey guys, Stephanie with here with this Ford Racing LSD for 31 spline 8.8 rears, or to break it down, 86 to 14 V8s and 2011 to 2014 V6 Mustangs. This Posi unit from Ford Racing is going to be a good option for the guys out there with an 8.8 rear that are looking to replace their diff with the next upgrade over stock. This diff has carbon discs and requires the use of 31 spline axles, which gives it that upgrade over the factory components. And if you're planning on or already have some bigger power and torque numbers from your 'stang, or the car sees some track time or hard launches, a differential upgrade should be something that you're looking into. There are a couple of reasons to change or upgrade your differential. Maybe you've got a stock diff and it's just getting old or chattering, or maybe you plan on hitting the drag strip and you've got some power that you'd like to cleanly get to the ground. Either way, this Ford Racing diff would be a good option, because it's got a balance of being an upgraded part that can handle more power and torque, but that isn't such an upgrade that it wouldn't make sense for a completely stock car to upgrade to. This diff is actually the same diff that came from the factory in the O3 to O4 Cobras, so it's a beefed up version of a factory style diff if you have any other Mustang besides the O3 to O4 Cobra. Like I mentioned earlier, this diff is going to require the use of 31 spline axles, so if you've got an O4 and under V8, you're looking at upgrading your axles, since those cars came from the factory with 28 spline axles. If you've got an O5 and up you can reuse your factory axles 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 diff 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 a 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 an LSD like this one here, is to allow both rear wheels to put 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, that'll create a useless wheel spin where the car loses its forward momentum, the LSD is designed to eliminate that spin. It'll transfer the torque of both wheels evenly and will have a few benefits in both street and track applications. This means a stable differential lock pattern that won't fail due to the upgraded components, and no slipping, more durability, gentle transitions, and even a quiet operation. This is going to work for cars with both solid axle and IRS, or independent rear suspension, and you'll need to reuse yours or grab a new 8.8 rear set since this diff will not come with aftermarket rear gears. One other note would be the recommended use of 75W90 rear gear oil, since those will give you the same oil weight as the factory, and you're going to need three quarts of that and four ounces of friction modifier for the initial fill. When it comes to the price, this rear diff is going to cost $230, and it's going to be the most wallet friendly option on the site when it comes to LSDs. There are some beefier options on the site if you really need to upgrade for power reasons, but those are obviously more expensive, and it's nice to see an upgrade over the factory components from Ford Racing that you aren't going to have to turn the red light on for. As for the install, you're going to need some experience for this one. You'll need a few different wrenches and sockets, but an impact gun is going to help you speed things up here, even though you can do this install with all manual tools if you wish. A lift would also really help, and you're going to need a torque wrench to do this properly. You're looking at about four hours' time and 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, draining and removing the rear diff covers, so you will need something to drain into. Once you have the diff uncovered, this is where the benefit of mechanical knowledge will come in. You'll need to rotate the axles until the diff pin retaining bolt is accessible, because you'll need to get this pin out so you can push the rear axles out of the diff. Once those are out, you're looking at backing out the diff-bearing cat bolts and pulling the diff out of the car. You need to reinstall the shims that are on each side of the diff bearings the exact same way that they came out, so keep track of those. The new diff bearings will need to be pressed onto each side of the new diff and you can reuse the ring gear off of the old diff. And after that, it's just a matter of reinstalling things. Reinstall the shims, reinstall the diff and the retaining pin, the axles, and the housing cover as well. Now, 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 whether or not you're going to install this yourself, or you're going to take it to a shop. Wrapping things up here, the Ford Racing LSD with carbon discs is to be used in 8.8 rears and with 31 spline axles. It's an upgrade over the factory diff unless you have an O3 to O4 Cobra, and in that case, it's an exact replacement. This diff is a good option for those looking for a maintenance replacement, or those looking for something to make sure that they get some extra torque planted squarely to the ground. And you can check it out some more right here at

    Limited Slip Differential. Is your stock rear end leaving you in the lurch? Then you need to upgrade to a Ford Racing 8.8" 31 Spline Traction-LOK Limited Slip Differential with Carbon Discs from AmericanMuscle. A Limited Slip Differential (LSD) sometimes referred to as a "Posi" will allow both rear wheels to put the power down on the pavement giving you better traction and more impressive burnouts.

    Carbon Discs. This Ford Racing Limited Slip Differential uses the same carbon fiber clutch pack used in the Cobra and Shelby SVT Mustangs. Carbon-fiber friction plates are much more durable and are designed for higher torque over there stock counterparts.

    Application. This Limited Slip Differential is the same original equipment used in the 2003-2004 SVT Cobra Mustang. It will fit both solid axle and independent rear suspensions (IRS) equipped V8 Mustangs from 1986 to 2014 and 2011 to 2014 V6 Mustangs. Requires 31 spline axles. Application Note: 1986-2004 V8 Mustangs came factory equipped with 28 spline axles, except for 2003-2004 SVT Cobras which were 31 spline. All 2005 and newer V8 Mustangs come equipped with 31 spline axles.

    Technical Note. You will need to reuse your factory 8.8” gear set, or upgrade to a set of our 8.8" rear gears required for this Limited Slip Differential. No aftermarket gears are included. For normal driving conditions we recommend you use 75W 90 rear gear oil. This will give you the same oil weight as factory. For colder temps or race use try 75w 140.

    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

    What's in the Box
    • (1) Limited Slip Differential
    Installation Info
    Tech Specs
    • 8.8" Limited Slip Differential
    • Includes Carbon fiber clutch plates for increased durability
    • Will accept anti-lock exciter ring
    • Requires 31 spline axles
    • Requires 3 quarts Gear Oil
    • Requires 4 ounces of CM-19546-A1 friction modifier with initial fill
    • Fits solid or independent rear suspension
    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

    Fits Mustangs equipped with a 8.8" rear end

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    44 Questions / 10 Answers

    Ask a Question

    What do i need to change on my 1998 V6 to make this work?


    • The 98 v6 will have stock a 7.5 inch rear end. You will need an 8.8 inch rear end housing, 31 spline axles for said 8.8 housing and 8.8 inch gears along with bearings, oil seals and such.


    Show 3 more answers Helpful (2)

    I have a 2007 GT and I'm planning to uprgrade the hearing to 3.73s, I also want to put this Ford performance traction Posi LOK in will I still need the LOK rebuild kit if I purchase this Ford performance traction LOK?


    • No, you would not need to purchase the LOK Rebuild Kit if you purchase the Ford Performance Traction - LOK Limited Slip Differential w/ Carbon Discs.


    Helpful (1)

    will i be leaving two lines on a burnout with this LSD


    • The Ford Racing Traction - LOK Limited Slip Differential w/ Carbon Discs - 31 Spline 8.8 in. (86-14 V8; 11-14 V6) will definitely give your Mustang a lot more traction. There will be no more one wheel burnouts with this Posi!


    Helpful (1)

    Will adding this to a 2012 V6 Mustang help at all in the 0-60 and 1/4 mile?


    • Pending on driving experience and track/road conditions...Maybe...but marginal gains as the only Mod and it shouldn't be the first Mod. It's price is the biggest selling point for this particular unit if 1/10th per 1/4 mile run means that much to you.


    Show 2 more answers Helpful (1)

    I have a 2001 mustang gt with an automatic transmission, the first question is would this differential be compatible? Second, would I be able to replace the gears to 4.10 ratio?


    Ok, I have been looking at your website plotting all of what I am going to do to my GT. I need some help and advice all together. It is auto trans which I am swapping thats first. Then I want to put the 4.10 gears in it with an aluminum drive shaft now I dont understand what Spline means. And I am confused on do I need to switch my rear differential or what is stock in mine good for the set up? I am not a mechanic nor have any experience working on cars I know what I want mostly and am having a pro put it together I just want to order my own parts from here to know what im getting other than letting him decide. Please HELP. And I know ill have a million other questions through this process


    • The Ford Performance Traction-LOK Limited Slip Differential is designed to accept 31 spline axles, the driveshaft's spline count will not be affected by this. Spline count refers to the number of splines (the small "teeth" that mesh together for your axles or driveshaft) so a 31 spline axle will not fit into a 28 spline housing, due to a different number of teeth or splines. Depending on the year and model of your Mustang, you may have 28 or 31 spline axles. More info can be found at the link below:


    Helpful (0)

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    Customer Reviews (67) Write a Review

    Overall Rating 4.9

    out of 5 stars

    Installation Time:Full Day

    Installation Cost:$250-$500

    • Performance Gain 4.673077 4.7
    • Fit 4.980769 5.0

    • 5/5

      Installation Time: Afternoon

      May 17, 2018

      Excellent add with new 4.10’s

      Sadly I’m not one to wait so I ordered 4.10’s elsewhere but wanted to upgrade the differential from stock. Very satisfied with this. No more pull to one side. Very excellent product and with 4.10’s the rapid acceleration is very smooth! So happy!


      Year: 2009 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Full Day

      April 28, 2018

      Excellent diff.

      Oem fit and finish, but the carbon clutch packs do a lot better job at getting the power to the ground than the oem clutches on corner exit. Was initially going to go with a torsen, but I also drag race my auto-x car because I make great life decisions, and didn't want to blow-asplode a torsen or the cash I spent on it trying to 60ft the car.


      Year: 1996 Submodel: Cobra

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      April 26, 2018

      Great product

      Very well built differential I highly recommend anyone to add this to their build list


      Year: 1996 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      April 25, 2018


      I have a 2012 mustang v6 that came stock with an open differential. Immediately after I purchased this product and installed it I noticed a major difference in the amount of horses I was laying to the concrete with power being evenly distributed to both tires. This is an excellent purchase for any v6 owner and a great replacement for any GT owner


      Year: 2012 Submodel: V6

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      April 13, 2018

      Did what I bought it to do

      Kept doing the great ol' one wheel burnout in my 08 gt. Bought this and fixed that problem on the spot. I got this product as well as 3:73 gears and new axle bearings. Good buy.


      Year: 2008 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Full Day

      March 26, 2018

      Great buy

      Bought this and had it installed along with a set of 3.73 gears, ( Ford gears were out of stock so had to buy from competitor) 3.5" one piece aluminum driveshaft, a Steeda throttle body spacer, Steeda CAI and 93 performance MPT tune all installed by Steeda in one day. It's only been a week and around 160 miles since instal so I haven't opened it up more than about 70, but you can just feel the power, so much more low end. If you want your 3.7 to be fast you have to get some 3.73 gears and a LS diff stop thinking about it and do it


      Year: 2012 Submodel: V6

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      March 21, 2018

      nice replacment

      Blew the stock one up on my 03 cobra, just replaced it with same one lol. fit was fine.


      Year: 2015 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      February 26, 2018

      Great for price

      Got the product and everything is as should be. Holds the power just fine and lock the wheels under heavy loads!


      Year: 1999 Submodel: Cobra

      Helpful (2)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      February 02, 2018

      Ford Performance

      great part but poor packing. I'm happy it wasn't damaged


      Year: 2012 Submodel: V6

      Helpful (4)

    • 5/5

      Installation Time: Full Day

      October 04, 2017

      Nice replacmint

      Nice replacement With acceptable price, i can’t not judge now that need enough time to know the quality


      Year: 2007 Submodel: GT

      Helpful (3)

    • 5/5

      September 29, 2017

      Well worth it.

      I was looking for a durable and reliable rear diff to upgrade my 05 F150 from the factory diff. I was sick of the one wheel wonder making it difficult to not get stuck off road or performing pathetic burnouts. I installed this along with some 4.88 gears. Now both rear tires always grab and the truck turns over the 38" tires with ease. Highly recommend.


      Year: 1995 Submodel: V6

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      August 03, 2017

      Great product

      Bought many of these when they were for sale at $179.99 but now at $259 its not such a great deal..disappointed they went up so much..


      Year: 2003 Submodel: Cobra

      Helpful (6)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      June 16, 2017

      Solid Fix

      Solid Product, had a vibration in the rear end, so I replaced everything in there. Also, had other work done at the same time. Overall, solid product and no problems with it since.


      Year: 2005 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $1000+

      June 14, 2017

      New Difference

      The Ford Performance Limited Slip Differential works well in 2011 V6 and with the one-piece drive shaft is even better. There were other suspension mods done at the same time which include Rear Control Arms, pinion align and 4 wheel alignment. Had the installation and alignment done by Certified Car Clinic (DBA CCC Motorsports) in Santee, CA good professional workmanship.


      Year: 2011 Submodel: V6

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      June 03, 2017

      changed along with gears

      Changed gears from 2.73 to 3.55, installed LSD at the same time since carrier was going to be removed anyway, turned out to be very good decision because I need the extra traction now on launch. LSD was a direct replacement for my stock 2012 V6, 31 spline factory axles, unit is very quiet and works great, I am using the royal purple 75/140 gear oil, took 2.5 quarts. If you're going to a lower gear and have an open diff I highly recommend this upgrade. Why leave one black streak on the pavement when you can have two ?


      Year: 2012 Submodel: V6

      Helpful (2)

    • 5/5

      May 26, 2017

      2002 Roush stage 2 Mustang

      Building twin turbo setup, can't wait til she is done.


      Year: 2002 Submodel: Other

      Helpful (4)

    • 4/5

      Installation Time: Afternoon

      May 17, 2017

      Good choice

      So far my best mod , I recommend this product thanks AM for a great price


      Year: 2013 Submodel: V6

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      April 23, 2017

      Quick service

      Took me a couple hours to install , works great positive engagement to the ground no complaints here


      Year: 1995 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Afternoon

      March 24, 2017

      Easy install

      Thru this in my 2001 Ford Explorer Sport Trac rear end without much difficulty. So if anyone is wondering, yes this will work in any Ford 8.8 rear end.


      Year: 2001 Submodel: Other

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      March 06, 2017

      Worth it!!!

      The diff on my s197 (over 125000 miles) was starting to make noise. I took it apart and found one of the spider gears had a small chip in it. Purchased this unit along with 373's and WOW what a difference. The car is much more enthusiastic and seems to have woken up during acceleration. Save yourself the time and hassle and just buy the whole unit. It is worth the money!


      Year: 2006 Submodel: GT

      Helpful (4)

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