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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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    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 AmericanMuscle.com 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 AmericanMuscle.com.

    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

    MPN# M-4204-F318C

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    What's in the Box
    • (1) Limited Slip Differential
    Installation Info
    Tech Specs
    Specifications:
    • 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

      Customer Photos (11) Submit Your Photo

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        Questions & Answers (55)

        5 Top Rated Questions

        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:https://www.americanmuscle.com/tech-article-axle-shafts.html

        Helpful (6)

        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 (3)

        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.

        Helpful (3) Show 3 more answers

        The term LOK, is it an abbreviation of the word LOCKER, such as Detroit Locker? If so, it would be a scary thought/experience in a street driven vehicle. The rear Wheels of my 2014, six cylinder, Mustang equipped with a limited slip differential has 38 deg. to 42 deg. play / free rotation before coming up against the resistance of the power train. Am Looking at poor pinion to ring gear set up, or severe internal wear? I need a straight answer, so if you would be so kind, I would appreciate your insight.

        • The Ford Performance Traction - LOK Limited Slip Differential is Ford's clutch type limited slip, and is not a locker. Ford does not measure rear end play based on a measurement at the wheel, but rather at the driveshaft, or at the pinion gear (with the diff cover removed) If you feel their is excessive play in the rear end, this could indicate wear, however if rear gears were recently installed a poor setup could also show the same symptoms.

        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 (2)
        Post Your Question
        10 More Questions
        Will adding this to a 2012 V6 Mustang help at all in the 0-60 and 1/4 mile? 3 answers
        My end state hp will be 650-700 hp for my 2008 Mustang GT, with Kenne Bell super charger. Would this more than adequately cover that hp range, or should I play it safe and get one of the other Ford Performance higher end diffs, like the T-2 Torsen or the FR500S? Thank you for you time. 1 answer
        Does this use a 7/8" or 3/4" crosspin? 1 answer
        Will this be a straight swap to my differential or would I have to buy new splines , ring and pinion gears and bearings etc..? 1 answer
        If I have a 2014 V6 Mustang will this work with my stock axles? Or will I have to buy new axles? 1 answer
        Is this suitable for forced induction? Im rebuilding my drivetrain from a 28 to a 31, I plan on adding a supercharger in the future. Will this LSD support the power? 1 answer
        Can I use Royal Purple MAXGEAR Synthetic oil, 75W-140 with the carbon fiber clutch discs in this differential? 0 answer
        Is this for an IRS 8.8? 1 answer
        It comes pre assembled. Does that mean the carbon discs are pre soaked in friction modifier? 0 answer
        Where is the the 31 spline axles that are required ? 0 answer

          Customer Reviews (85) Write a Review

          Overall Rating 4.9

          out of 5 stars

          Installation Time:Full Day

          Installation Cost:$250-$500

          • Performance Gain 4.714286 4.7
          • Fit 4.985714 5.0



          • 5/5

            Installation Time: Full Day

            May 05, 2019

            LSD

            This LSD has the features I need for the mild custom build I'm doing on our '05 GT convertible. I do thrash the throttle on a consistent basis so I need the extra protection from breakage.

            RonaldG

            Year: 2005 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            April 03, 2019

            Great Posi

            Awesome posi as a replacement part. Nice upgrade for 31 spline.

            JohnnyGearz

            Year: 2005 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            March 01, 2019

            Great

            These went great with my 4:10 gears didn’t take long to install. .

            StepphonS

            Year: 2005 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Full Day

            February 07, 2019

            No More Singing

            Great product that I would expect from Ford Performance. Install included new ring and pinion, so the whole rear-end was a complete replacement. All I can say is wow! Didn't know how much actual performance had fallen off over the 265K miles on the original.

            Richm3i

            Year: 2005 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Afternoon

            January 27, 2019

            Excellent

            One of the best things I bought for my car, definitely recommend. Got this one the Barton hybrid shifter, Ford performance drive shaft, 3.73 gears and it's great.

            ScottyP

            Year: 2013 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Afternoon

            January 18, 2019

            Very good product

            Very good product and great place to shop order and got it very quick

            yellowstang03

            Year: 1989 Submodel: LX

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            December 27, 2018

            Fantasztikus!

            Nem győzöm pakolgatni a sebesség fokozatokat. Lenyűgöző hogy mennyire jól eltalálták a formályát. Szivesen vennék többet is belőle annyira tetszik!:)

            ZsoltP

            Year: 2008 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $500-$1000

            November 30, 2018

            New differential

            Wow is all I can say, car feels like I could pull a tree down! Rear end feels very strong and stable. Car launches as if I’m on Slick’s, no noise at all either.

            Lexus

            Year: 2012 Submodel: GT

            Helpful (7)

          • 4/5

            Installation Time: Afternoon

            November 28, 2018

            01 cobra

            Product is just like oem made my drive line like new again thanks AM for the fast service and great quality

            JoshuaR

            Year: 2001 Submodel: Cobra

            Helpful (4)

          • 5/5

            Installation Time: Full Day

            November 23, 2018

            Wiow

            I purchased a set of 4:10 gear set and while doing so figured I’d change out my factory 28 spline axels and differential for 31 spline. Right out of th box you could tweet the quality of this product. The up grade was phenomenal and very well worth the cost. Shipping was supper fast and th performance difference was night and day.

            JonD

            Year: 2002 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            November 05, 2018

            Awesome!

            Perfect fit in my 2013 3.7L. Put it in with new Motorsport 3.31 gears! No problems! Make sure you use the Ford friction modifier!

            MatthewH

            Year: 2013 Submodel: V6

            Helpful (7)

          • 5/5

            Installation Time: Full Day

            November 05, 2018

            LOC UM UP

            locs them up fur sur, geter done! Helps Kills them tyers, better have some spares!

            Stanger

            Year: 2005 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $500-$1000

            September 17, 2018

            Great!

            This ford performance lok diff. Is amazing you can really feel the difference!

            Travis

            Year: 2013 Submodel: V6

            Helpful (5)

          • 5/5

            September 11, 2018

            Huge improvement over stock diff.

            I had been experiencing the classic signs of a worn out diff in my 3.7 for a few months, and had purchased the 3.73 gear kit, so I went ahead and bought the ford performance traction -LOK as well to fix the issue and save a little cash with the install. Day one out of the shop and the difference is night and day. Where previously I would put the pedal down to get in a small break in traffic leaving a parking lot and the car would move like it was doing the hokey pokey, it now powered clean Nd smooth through the turn, without either tire breaking traction or losing power. Even when the old diff was new, it wouldn't have handled itself as well as this one did! You really dont know what you're missing if you have the 3.7 without the performance pack, get this now!

            Streetenemy

            Year: 2014 Submodel: V6

            Helpful (7)

          • 5/5

            August 08, 2018

            Better than stock

            Perfect fit, better transmission and good feeling.

            LarryK

            Year: 2006 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Weekend

            July 16, 2018

            Smooth and powerful operation

            I put one of these in my 2006 Crown Vic after rebuilding the whole rear end. I haven’t had the time to really get on it as I’m still going through the break-in period, but I can already tell how smooth and strong this new LSD is, no more howling or grinding noises that my old LSD from the factory was making, not to mention the worn out clutches. I’m confident it will last many years and will handle just about anything I throw it’s way.

            ScottG

            Year: 2006 Submodel: GT

            Helpful (11)

          • 5/5

            July 10, 2018

            Works great good and solid

            Works great for the price no problems no rear noise

            CarsonI

            Year: 2008 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Full Day

            July 09, 2018

            3:73 gears

            Upgraded entire rear end 3:73 with limited Slip Diff, 31spline axle, and SR performance drive shaft. YES BIG difference

            J530

            Year: 2002 Submodel: GT

            Helpful (8)

          • 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!

            NathanB

            Year: 2009 Submodel: GT

            Helpful (8)

          • 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.

            Paulanderson

            Year: 1996 Submodel: Cobra

            Helpful (8)

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