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

58 Reviews
Our Price


  • Item #50092
  • MPN# M-4700-C

  • Market Price $129.99
  • You Save 17% ($22.03)
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Product Videos
  • 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: 1979 1980 1981 1982 1983 1984 1985 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
Hardware included:
  • Carbon Fiber Clutch Pack
  • Shims
  • (1) S-spring (31 spline)
  • (1) Cross Pin Bolt
  • Instruction sheet
Installation Info
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
  • Foxbody - 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93
  • Mach 1 - 03, 04
  • 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

Not compatible with Mustangs equipped with a 7.5" rear end

Most Helpful Reviews

Must Replace

At some mileage point, these are worn out in every Mustang on the road. The degradation of these happens over years of driving and is hardy noticeable until they're bad. I'm sure some owners just assume ...

Read More
Helpful (1)

Trac LOK

really works great my Stang feels new after install

Helpful (1)

Overall Rating 4.9 out of 5 stars
Read All 58 Reviews

Review & Install Video

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12 Questions / 22 Answers

Ask a Question

Lok rebuild kit Is this kit only for autos or 5 speeds aswell? Do I need this kit my 02 gt only Has 95000 km on it Thanks


  • Both transmissions. It's a great kit and it's highly recommended to install when rebuilding a rear end on your mustang. It would be a good idea to get this kit along with the Rear End Rebuild Kit which includes bearings and races.


    Good Answer (1) (0)

Show 4 more answers Question Resolved

around how many miles should i replace my stock ones im installing some 4.56 gears and the Bering kit. should i just do these at the same time


  • If you are planning on doing these in the future, you definitely should think about doing them at the same time as your gears and bearing kit. It will save you installation time and additional fees. The rebuild kit is more durable than your stock parts and are designed to hold more power and torque! That said, it's not necessary to replace these, but they will help with overall performance in combination with your new gears! If you have any additional questions, never hesitate to call us!


    Good Answer (2) (0)

Show 3 more answers Question Resolved

How do I know if I have a 31 or 28 spline


  • Count the splines on the axles and this kit works on 28 spline or 31 spline.


    Good Answer (2) (0)

Show 4 more answers Question Resolved

Should I use the stock 28 spline or the provided one? I've heard two different things on this subject. The only thing in the rear that isn't stock will be the new gears.


  • Stock, your 2004 GT has the 28 spline axles. If you are not upgrading your axles to 31 spline axles, you will need to use a 28 spline S-spring for installation. 31 spline axles are stronger and are a great upgrade when your Stang is putting down lots of power. That said, you can't mix and match the 28 with the 31 spline parts. They all have to match. I hope this helps!


    Good Answer (3) (0)

Show 1 more answer Question Resolved

What kind/type of oil is recomended? What oil should you use? So you have to add the limited slip additive from ford? Is there any thing better royal purple, amsoil etc?


  • Since you are rebuilding the Diff, it's the same as if you were just changing the fluid, so you need to use 75W140 Gear Oil and the Friction additive. People here on AM and the Forums swear by Royal Purple, so it's probably a good bet. For the additive, just go with the Ford Racing stuff. Both can be bought on AM.


    Good Answer (3) (0)

Show 3 more answers Question Resolved

How many splines on a 2013 base V6?


Show 1 more answer Answer This Question I need this answered (0) (0)

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Customer Reviews (58) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Afternoon

Installation Cost:$250-$500

  • Performance Gain 4.617647 4.6
  • Fit 4.857143 4.9

  • 5/5

    Installation Time: Full Day

    June 18, 2016


    Bought this with my 4:10 gears.....while your upgrading your gears might as well get the diff running right...This kit has made a great improvement in getting every bit of traction to the ground....and for the price well worth the purchase...


    Year: 2007 Submodel: GT

    Helpful (1) (0)

  • 4/5

    Installation Time: Afternoon

    July 01, 2014

    A good thing to do with gears

    I would recommend to do these when you install gears to replace the worn and used ones in the rear. Really helps tighten it up and create a better feel.


    Year: 1996 Submodel: Cobra Cinnaminson NJ

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    April 06, 2014

    carbon discs

    i had a bad bearing and while it was all apart i decided to replace my stock discs with 78k miles on them with these. 90% of the time i would leave 2 marks, but once in a while i would only leave 1, so i knew it was on its way out. install was very easy and these things really grip! ive ran a locker before and this is very similar to it in the amount of slip, or lack there of, it allows. if you have the rear apart or are changing fluid, spend the additional 30 minutes to install these, you will not be disappointed!


    Year: 2007 Submodel: GT Jupiter, FL, USA

    Helpful (1) (0)

  • 4/5

    Installation Time: Afternoon

    March 23, 2014

    this a good stock replacement

    this product is a good stock replacement for a farely stock car but I am going to replace my career with a eaton posi unit.


    Year: 2009 Submodel: GT Richmond, VA, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    January 16, 2013

    Must Replace

    At some mileage point, these are worn out in every Mustang on the road. The degradation of these happens over years of driving and is hardy noticeable until they're bad. I'm sure some owners just assume that is the way the cars work. If you're lighting up the right rear during acceleration / launch, your clutch packs are worn out. Replacing them will get the limited slip (and left and right rear) working properly. The difference is astounding. These along with Steeda Subframe Connectors are must buys.


    Year: 2003 Submodel: GT Minneapolis, MN, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    October 25, 2012

    gear clutches

    these clutches are pretty easy to install and are made of good material.


    Year: 1995 Submodel: GT Ft. Benning, GA

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    October 05, 2012

    Great product

    Bought the traction lok rebuild kit for my 01 cobra great swap with everything included


    Year: 2001 Submodel: Cobra Salyersville ky

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    May 19, 2012

    Quick fix

    Nice product. Did the install in a few hours didn't even take the carrier out of the car despite what some sites say the spring with this kit will not fit 28 spline axels. Got a new spring from the local dealer for 18.00 thanks Am.


    Year: 2003 Submodel: GT Dsm, Ia

    Helpful (1) (0)

  • 5/5

    January 14, 2011


    Product went well with the 4.10 gears, the installer requested it so I ordered it and had them in 2 days!


    Helpful (1) (0)

  • 5/5

    November 15, 2009

    Trac LOK

    really works great my Stang feels new after install


    Helpful (1) (0)

  • 5/5

    May 12, 2011

    Works great!

    I purchased this Trac-lok kit with a set of 410 gears and bearing install kit. When I opened up my rear end to inspect the original 308 gears, bearings, and trac-lok I found that the original friction plates had broken tabs. I found them in the bottom of the housing all bent up from the gears. I was also getting one wheel burn outs due to the failing traction lok. I rebuilt my traction lok with this kit instead of paying $200 plus for another one. All together it took me about 15mins to rebuild the traction loc, although I did soak the friction plates for 24 hours prior to install. I could NOT use the S spring that came with the kit. It seemed thicker and I could not get it to compress enough to fit. Nevertheless I did reuse the original S spring and got it back in with a pair of 9" needle nose vise grips and a pair of 11" needle nose pliers. After you install the friction plates which come arranged in the proper order from American Muscle just slide in your side gears and while holding them in place put one pinion gear in at a time and rotate the side gears to pull the pinion gears into place. When you put the S spring in squeeze one half of the spring with the needle nose vise grips and lock them. Use your 11" needle nose pliers to reach through the traction loc carrier and squeeze the other half of the spring while pulling it into the carrier. When you reach through and grab the other half of the spring, don't grab both outside edges of the spring because you can't fit the spring plus your pliers through the carrier. Grab the spring in the center and on one edge of the spring. It will be hard to compress by hand but the idea is only to get the spring started between the gears. Once you have done this use a hammer and a small block of wood to tap the spring into place. Put some gear oil onto the spring and it will slide into place much easier. Again it only took me about 15 minutes to do. Getting a second person to tap on the spring while you pull on it with the pliers to guide it into place will make it much easier. Rebuilding one of these traction lok units is not hard to do. As long as your gears are ok in the unit I'd just rebuild it, but if you need to replace the gears as well it might be more beneficial to just buy another traction loc unit. Also after I installed my traction loc and 410 gears I did not get any noises. Soak your friction plates over night like I did if you have to but once it is all done you should not get any noise. If you do hear anything, such as a popping sound like someone has reported I'd pull my cover off and inspect the unit for broken tabs or chipped ring gear teeth.


    Year: 1991 Submodel: GT

    Helpful (15) (1)

  • 5/5

    October 17, 2009

    Good Rebuild

    Was originally tempted to get a whole new posi, but this was a far cheaper alternative. Unless you really wanna upgrade to a 31 spline axle too I would recommend a rebuild with this kit.


    Helpful (7) (0)

  • 5/5

    May 03, 2011

    Carbon Disc Traction-LOK

    I had a Ring and Pinion shop professionally install these, along with Ford Racing 4:10 gears, and the car hooks very well, the spring that it comes with is for use with 31 spline axles though, so you need to reuse yours if you still have the stock 28 spline axles, or get the correct spring (smaller) from a Ford dealer

    Mike Robins

    Year: 1999 Submodel: GT

    Helpful (4) (0)

  • 5/5

    Installation Time: Full Day

    March 31, 2013

    Great upgrade!

    I removed my complete rear axle assembly to perform a gear swap and control arm upgrade. My 1990 GT has 78,000 miles, so I figured I should rebuild the differential while it was apart. The carbon disc kit is worth the extra money compared to the standard disc kit. I installed 3.73's and the new carbon discs are working great! About 150 miles on the new setup and i love it. Two even black marks every time!!!! The kit can packaged nicely and was easy to install. I do wish they would offer a kit that included a new 28 spline spring.


    Year: 1990 Submodel: GT Waterford, MI

    Helpful (2) (0)

  • 5/5

    September 01, 2010

    Nice kit

    Complete kit came with two seperate packages to keep disc in order. Used with a 4:10 gear swap, cheap insurance if you already have the gears out, go ahead and change your axle bearings while you are in there!!!

    Larry Nanoy

    Helpful (2) (0)

  • 5/5

    May 04, 2009

    Great Product

    Just like the description says \"If it is time to rebuild your rear dont cheap out\" this is true, I cheaped out when I got my gear installed and 4 months later I had problems in the rear end. I had clunking and howling noises, Installed new clutch paks and it runs great, shifts hard and smooth. Great Product and amazing quality

    Chris from Chicago

    Helpful (3) (1)

  • 5/5

    Installation Time: Full Day

    November 02, 2011

    Great update for warn Tlocks

    If you have the one wheel blues in your GT or Cobra, this fixes that. Installation is straight forward, for those who have rebuilt a rear before. Parts are great quality and everything is included for a solid rebuild. SOLID SOLID bite every time. Con: For DD apps, this kit WILL wear faster then the stock rebuild kit. How much faster depends on your driving. There are mixed reviews on this, and I haven't noticed any degradation in the 20,000 I have run on the kit.


    Year: 1997 Submodel: Other Del Norte, Colorado

    Helpful (1) (0)

  • 5/5

    November 11, 2009


    Installed new gears in my rear end, alot of noise afterwards. this kit helped cure the problem! Would recommend to anyone installing new set of gears or rebuilding the rear end. Great product!


    Helpful (1) (0)

  • 5/5

    Installation Time: Full Day

    March 26, 2013

    Ford Racing LOK carbon disc rebuild kit

    Awesome product. And yes the S spring is for the 31 spline rear end. You can get the bigger spring in, but you pretty much have a spool type rear end.


    Year: 1994 Submodel: GT Portland, OR

    Helpful (1) (1)

  • 5/5

    January 21, 2011


    great kit comes with everything you need for a reliable rebuild onley thing is that the s spring that comes with the kit wont fit its just to damn big. good luck on using it


    Helpful (1) (1)

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