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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)

Market Price $127.99 You Save 12% ($15.02)
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$112.97

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  • Item 50092
  • MPN# M-4700-C

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Features, Video & Details

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

Review & Installation Video

Review & Install Video

Hey guys, Stephanie with AmericanMuscle.com, 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 AmericanMuscle.com.

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

Specifications:

  • 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

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
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 ...

Read More
Helpful (20)

5/5
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)

Overall Rating 4.9 out of 5 stars
Read All 90 Reviews

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19 Questions / 6 Answers

Ask a Question

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

JoshuaW

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

    VincentV

Helpful (1)

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?

RichardS

  • 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.

    AMwhitecobraadam

Helpful (1)

Does this kit work with an automatic transmission?

BB

  • The Ford Performance Traction - LOK Rebuild Kit w/ Carbon Discs - 8.8 in. (86-14 V8; 11-14 V6) will work with both automatic and manual transmissions.

    Ricky36

Helpful (1)

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

johnB

  • 13-14 GT500s models use different components than those included in the Ford Performance Traction - LOK Rebuild Kit w/ Carbon Discs - 8.8 in.

    AMJackson

Helpful (0)

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

NicolasS

  • 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.

    Rob D

Helpful (0)

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?

DeonJ

  • Although not required on a vehicle with 50,000 miles on it, I always recommend getting the rebuild kit as well. Might as well do it while you have everything apart and you are underneath the car already.

    Doug P

Helpful (0)

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Customer Reviews (90) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Afternoon

Installation Cost:$100-$250

  • Performance Gain 4.772727 4.8
  • Fit 4.880597 4.9



  • 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.

    Joe

    Year: 1991 Submodel: GT

    Helpful (20)

  • 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.

    Leo

    Helpful (7)

  • 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)

  • 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 (4)

  • 5/5

    Installation Time: Afternoon

    March 26, 2016

    Perfect!

    These disc packs were both 0.655" thick, which is absolute maximum allowable, and they fit perfectly! Both axles have zero end play. I left out the S spring to give them longer service life, and it still locks up easily and functions perfectly.

    GBLT

    Year: 2008 Submodel: Bullitt

    Helpful (3)

  • 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.

    Don57

    Year: 2003 Submodel: GT Minneapolis, MN, USA

    Helpful (3)

  • 5/5

    September 03, 2016

    Solid product

    I had this kit installed as part of my upgrade to 3.73 gears. Before the change my rear end would drift to the left during hard starts. Now I get full traction from both tires. I highly recommend this kit if you are upgrading your rear end gears. This is a great product for the money.

    IslandMustang

    Year: 2001 Submodel: GT

    Helpful (2)

  • 4/5

    Installation Time: Weekend

    June 04, 2016

    4:10 gears are the business

    I ordered the Ford racing 4:10 gears for my 02 GT vert I had a local shop install (know the owner and got my hands dirty a little too)and I also got the traction LOK rebuild kit everything went together flawless. Loved he simplicity of how they go it I recommend getting all new bearings too but great product and great power gains definitely a first mod for your stang for the speedo I tuned it for the gears and for the performance aspect 0 to WOW right now definitely most bang for your buck

    Blue2vterror

    Year: 2002 Submodel: GT

    Helpful (2)

  • 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.

    Stngbng15

    Year: 1990 Submodel: GT Waterford, MI

    Helpful (2)

  • 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)

  • 5/5

    September 01, 2010

    Nice Kit

    Kit came complete with disc packaged in two groups for installation. Used in conjunction with a 4:10 gear swap, cheap insurance if you have the gears out.

    Mach 1

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    February 07, 2017

    While you are there, why not?

    My car has 130,000 miles and the old disk were in good shape. However, for the money, it would seem foolish to me not to do a full update while you have it apart. AM should sell an axle bearing and seal kit as part of a total rear rebuild. We did mine and now every bearing and seal in the rear axle is new. I'm rating this as less than an hour because, it will probably be part of a larger overhaul.

    ThomasD

    Year: 2007 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    January 19, 2017

    Read the instructions first!

    Read the instructions first! The discs need to be soaked before install so make the trip to the store first! You will also need needle nose vice grips to pinch the spring for install. You can search for how to videos on Youtube. Not a fun product to install but very necessary if those discs in the back are getting old and worn out.

    ksack

    Year: 2006 Submodel: GT

    Helpful (1)

  • 5/5

    September 06, 2016

    Can't wait to install these

    Recently upgraded the rearend of my 84 GT with a larger (stock) 8.8. Unfortunately the gearing is lacking, the pinion seal is shot, and it only spins one tire. What better time to rebuild the rear end than with a FRPP 3.55 gear kit with all new seals, and a carbon disc kit so I can go with both rear wheels!

    Sergio

    Year: 1984 Submodel: GT

    Helpful (1)

  • 4/5

    September 01, 2016

    Carbon Fibre Upgrade

    Great product and upgrade. The only complaint was not having the S-Clip option for the 28 spline axles. Clip was not cheap from the Ford Dealer. All-in-all it is putting the power to the pavement...hard shifts chirp the tires in 3rd and 4th gears now...can't wait to get the car on the track.

    BCChromeYeller

    Year: 1999 Submodel: GT

    Helpful (1)

  • 5/5

    August 23, 2016

    What I was expecting

    The product seems good quality. The only thing I'd like to see AM do is post some video link resources on how to install products like this.

    Lenbo

    Year: 1995 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    June 18, 2016

    GREAT UPGRADE

    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...

    encinoman

    Year: 2007 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    May 19, 2016

    got the new clutches an gears

    I like the new clutches help take of faster with both wheels lockin up an also when doin a burnout

    cludus

    Year: 2001 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Weekend

    July 08, 2015

    What a difference

    Ever since I bought my mustang used a had a horrible whining and grinding noise from the old factory traction LOK/clutch pack. These are leagues better than stock and were fun to install. I took my time with this project and installed new axles and bearings and along with the friction modifier, not even a peep from my differential. The fit was tight but perfect. Thank you AM for yet another great product!

    SeminolePride

    Year: 2003 Submodel: GT Palmetto Bay, Florida

    Helpful (1)

  • 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.

    PatW

    Year: 1996 Submodel: Cobra Cinnaminson NJ

    Helpful (1)

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