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

Market Price $274.99 You Save 17% ($46.00)

$228.99

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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

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
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
  • Foxbody - 86, 87, 88, 89, 90, 91, 92, 93
  • Mach 1 - 03, 04
  • V6 - 11, 12, 13, 14
  • Bullitt - 01, 08, 09
  • Cobra - 94, 95, 96, 97, 98, 99, 01, 03, 04
  • GT - 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, 13, 14

Fits Mustangs equipped with a 8.8" rear end

Most Helpful Reviews

5/5
Traction Lock Carrier

The carrier was well packaged and delivery was fast. Fit was perfect. Run out was less than 0.001". Very pleased. Replaced my existing carrier which had a bad run out 0.008".

Helpful (1)

5/5
Ford Racing Limited Slip with Ford Racing 3.73

Replaced what I believe was a stock limited slip diff with this since the stock one was wearing out and squealing/moaning. Since I was getting this done, I went ahead and did the whole rear end, put in ...

Read More
Helpful (1)

Overall Rating 4.8 out of 5 stars
Read All 45 Reviews

Customer Photos (5) Submit Your Photo

View All 5 Photos

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22 Questions / 19 Answers

Ask a Question

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

dwat89

  • 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.

    Shrapnel

    Good Answer (1) (3)

Show 2 more answers Question Resolved

Wihis work on a 2008 v6?

SuperStang

  • no. the stock rear end on a 2008 v6 is a 7.5in. To use this you will need to upgrade the entire rearend to a 8.8in rear end. you can get a LSD for a 7.5in from ebay if you are patient, or you can upgrade to an 8.8in rear end from here or other places.

    TheMistress

    Good Answer (1) (0)

Show 3 more answers Question Resolved

Installation? What is a range of professional installation cost?

cottonball95

  • Since every shop and location charges differently hourly rates, it's hard to give you a set range. I'd suggest contacting a few local shops in your area to get quotes on approximately 4 hours of installation time. Hope this helps!

    LisaS

    Good Answer (1) (0)

Show 2 more answers Question Resolved

Does the 2012 V6 Mustang have a 31 Spline axel? I was looking at getting the ford racing traction-LOK limited slip differential. It requires a 31 Spline axel. Does the 2012 V6 have this axel, or would I need to get a new axel? Thanks.

Raceboy

  • Starting in 2011 both the 5.0 V/8 and the 3.7 V6 were equipped with the 8.8 rear end which uses the 31 spline rear axles.

    CalifSpec2

    Good Answer (1) (0)

Show 2 more answers Question Resolved

What else would i need to install this? Would i need a new 31 spline driveshaft aswell as the axles or just the driveshaft? I run a stock 8.8 28 Spline

CDsStang

  • you will need to replace your 28 spline axles with 31 spline axles. drive shaft, gears and everything else attached to your rear end can stay the same.

    TheMistress

    Good Answer (0) (0)

Show 2 more answers Question Resolved

3.73 gears does this have to be changed if i get new gears?

tburger

  • No, you do not need to change this if you re gear your car.

    BabyGT04

    Good Answer (0) (0)

Show 2 more answers Question Resolved

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Customer Reviews (45) Write a Review

Overall Rating 4.8

out of 5 stars

Installation Time:Full Day

Installation Cost:$250-$500

  • Performance Gain 4.666667 4.7
  • Fit 4.966667 5.0



  • 5/5

    August 03, 2016

    Peace of Mind.....

    I had this diff installed with Ford Racing 4.10's and love it. You can't beat it for the price and it handles the extra torque the 4.10's throw at it and then some. If I could put it in one word I would say "SOLID" My mechanic told me I picked a GREAT diff for my set up which made me feel REAL good. Thanks AM! You guys Rock!

    GruntMarine

    Year: 2006 Submodel: GT

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $1000+

    August 05, 2015

    Ford Racing Limited Slip with Ford Racing 3.73

    Replaced what I believe was a stock limited slip diff with this since the stock one was wearing out and squealing/moaning. Since I was getting this done, I went ahead and did the whole rear end, put in 3.73 gears and new rear axles to go from 28 spline to 37 spline for this. Was a bit of a pain because I have the ABS option on the car but got the right axles for that and the shop got it in. I must say, the rear end is completely quiet now and feels like I got more power. The mechanic that installed the parts said he was really pleased with how everything went together so smoothly and perfectly. Feels great and sounds perfect again.

    MustangGT98

    Year: 1998 Submodel: GT California

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    June 26, 2015

    Peel outs are safe and easy.

    After having my 3.73 gears installed my stock differential gave out. You could hear rear end noise especially when turning. I also had humming from my 3.73 gears because the pinion depth and back lash were not set properly. I had both the differential and and new set of 3.73s installed. Very smooth peel outs. If you don't turn your front tires you will stay perfectly straight when giving it off the line. I have performance tires as well so those help. EAGLE F1 GS D3s. My drives haft isn't holding up with bolt ons and the new 3.73s. Symptoms are clunking and vibrating. I have received my 1 piece aluminum drive shaft. Review to come for the drive shaft as well.

    Peanuts

    Year: 2008 Submodel: GT Canada

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    May 17, 2015

    Traction Lock Carrier

    The carrier was well packaged and delivery was fast. Fit was perfect. Run out was less than 0.001". Very pleased. Replaced my existing carrier which had a bad run out 0.008".

    Frankenstein

    Year: 2007 Submodel: GT500 SEPA

    Helpful (1) (0)

  • 5/5

    Installation Time: Full Day

    November 06, 2014

    Great Product!

    I installed this unit along with Moser 31 spline axles. Rear end feels a bit more solid and I don't have to worry about beating it up on the street and track with 650HP+. Great price too!

    StanS

    Year: 2013 Submodel: GT Philadelphia, PA, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    June 10, 2014

    Cheap for a carrier

    Pretty cheap for a carrier, new clutches, new spiders, S spring, and center pin. They even give you the bolt that locks the pin in. If you priced it seperatly its definatly worth it. Since its a cobra carrier it does not have notches where the clutch packs lock in. This is where my old carrier cracked and failed. Fits all 8.8 31 spline, including Bronco's/F-150's like mine.

    Garypmjr

    Year: 1995 Submodel: Other Piscataway Township, NJ, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    October 13, 2013

    Love this diff.

    Great difference in the feeling that's it is not going to break when I launch at the track.

    pibirdman72

    Year: 2007 Submodel: GT Houston, TX

    Helpful (1) (0)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    May 20, 2013

    Good solid LSD

    I have put this thing through the ringer at the track on full drag slicks and it is holding up like a charm.. Install was done by a local speed shop, but really is not hard to do if you are the wrenching type. Well worth the money.

    TheBigHerm

    Year: 2005 Submodel: GT Valparaiso, IN, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Full Day

    January 28, 2012

    awesome product

    excellent product and not too hard to install. the only real pain is trying to shim it into place, but other than that, only took a day or so to get installed. with 4.10 gearing and 31 spline axles, this really helps with those hard launches at the track. thumbs up!

    2003greyMach

    Year: 2003 Submodel: Mach 1

    Helpful (1) (0)

  • 4/5

    Installation Time: Afternoon

    January 27, 2012

    best bang for your buck with tloks

    i have one of these in my 95 5.0 which has 4.11 in it and launching it is much easier now. this isnt that hard to put in yourself in a couple hours and it beats paying over 400 for the other tloks out there. i also have one in my truck the extra traction realy helps out in the mudd and snow.

    canary95

    Year: 1995 Submodel: GT

    Helpful (1) (0)

  • 5/5

    October 14, 2010

    Barry

    The clutches in my old posi were worn so I decided to upgrade to 31 spline axles, which I also purchased with the FMS posi. As expected, no fitment issues. So far 16 passes on the 1/4 mile, hard launches with drag radials and a fair bit of street use and all is well. Very satisfied with the product.

    Barry Stanley

    Helpful (7) (0)

  • 5/5

    October 14, 2010

    great differential

    installed this differential into my 2001 mustang Bullitt. this is a great up grade from the stock differential. both wheels lock together when you throw the torque to it. would recomment this differential to anyone that wants to up grade from the stock unit. all in all I love the way this diffenential works.

    Don

    Year: 2001

    Helpful (6) (0)

  • 5/5

    August 31, 2009

    The way to go

    Mix these up with 31 spine axles and not only will it future proof your ride but i makes burn outs and sliding much more predictable at the limit and if you have 4.10s this is how you find your traction

    Blair

    Helpful (13) (4)

  • 5/5

    December 11, 2010

    Great improvement!

    Bought this as part of a complete rear-end rebuild on a 1995 GT. My old posi was doing 1 wheel burn outs and this fixed that issue. You can feel it pull a lot harder now. This unit was very well built too- much higher quality than the stock one.

    Steel_Venom

    Year: 1995 Submodel: GT

    Helpful (5) (0)

  • 5/5

    October 14, 2010

    Great Diff

    I paired this diff with Moser axles and its seen plenty of burn outs and hard launches on drag slicks. I cut 1.6 60ft times with a bolt on 04 Mach 1. Great diff for the price and great traction.

    Aaron

    Year: 2004

    Helpful (5) (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    May 14, 2014

    Great Price

    First time we used you guys. Great price,was here in one day. Great experience. Thanks Pine Grove Auto Sales and Service

    Brad8080

    Year: 2007 Submodel: GT Pine Grove, PA 17963, USA

    Helpful (2) (0)

  • 5/5

    October 14, 2010

    Awesome

    This did exactly what it said it would. It's a great upgrade and no more complicated to install than any other diff. I was in the back changing out the gears so I decided to do the T-Lok as well. Thinking about getting steeper gears? Might as well do the T-Lok at the same time and save time, money, and knuckles!

    Dave B.

    Helpful (3) (1)

  • 5/5

    Installation Time: Afternoon

    December 12, 2013

    Ford Racing 31 Spline Cobra Differential

    I drag race my street licensed 2002 mustang GT, and it's just a matter of time until you snap the factory 28 spline axles, and have to have your car towed home, if you use any kind of street/strip racing tire. I went with a 31 spline up grade racing/street axle, and because I've had very good luck with Ford racing products, I went with the 31 spline Cobra differential from American Muscle. I opted for a racing specialty axle and have had to engineer the ABS system , so that it still operates. So if you want to do this upgrade be sure to ask if the new axles accept the factory ABS rings, other wise, know going in, that if you upgrade with specialty axles, you may loose your ABS system. No big deal, but be advised.

    pilot

    Year: 2002 Submodel: GT St. Louis, MO

    Helpful (2) (1)

  • 5/5

    July 06, 2011

    31 spline diff

    worked and fit great, i would use this again if the time comes

    Derek

    Year: 2002 Submodel: GT

    Helpful (2) (1)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    March 18, 2013

    definite improvement, no more rubbing sound

    I had this "Cobra" diff installed on my 2006 GT with a 3.73 Ford Racing ring & pinion, new bearings, and a Steeda diff cover. The shop i took it to did it for $500. The car feels a little quicker to accelerate compared to the 3.55s that were stock, and the new rearend is not giving me the rubbing sound I had before when making low speed turns. There is a slight whirring sound at highway speed with the new setup, which the guys a the shop told me about. Only about 200 miles on the new rear end, but I am happy with it. I chose the 3.73 rather than 4.10 or higher because I didn't want to have to run high rpm on the interstates (75mph limit in Montana). The 3.55 was consistently 100 mph at 3,000 rpm in 5th gear. Seems like 500 more rpm for same cruising speeds with new gears.

    PSUX2

    Year: 2006 Submodel: GT Montana

    Helpful (1) (1)

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