Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $5,000 For Your Mustang! Enter Daily
Win An Eibach Sportline Kit! Enter Daily

Yukon Gear Duragrip Posi Rear Differential - 28 Spline 8.8 in. (86-04 V8)

Market Price $627.29 You Save 13% ($81.82)
Our Price


FREE Shipping

  • Item 21611

Will this fit your Vehicle?

Change Vehicle Help?
In Stock Ships same business day.
Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    Features, Video & Details

    • Put All Your Power to the Pavement
    • Assembled 8.8" Limited Slip Differential
    • Heavy Duty - Nodular Case with Forged 4320 Internals
    • Composite Clutches Included
    • Requires 28 Spline Axles
    • Fits 1986-2004 V8 Mustangs (Excludes 1999-2004 SVT Cobra)

    Review & Installation Video

    Review & Install Video

    So the Yukon Gear Dura Grip positraction differential should appeal to the New Edge and Fox owners out there looking to replace a worn out, or busted factory or aftermarket differential in their Mustang and want to go with a trusted name like Yukon Gear. The price point is going to be right around $500 for this guy, and it is going to get a full three out of three wrenches on the difficulty meter from me, with a little bit more detail later on. Now, before you go any further with this video, I just want to get this out of the way. "Positraction" or "posi" was a term originally coined by GM back in the day, and the name just kind of hung around to describe a certain kind of differential. That differential, at least in this case, is something like this, a clutch-based differential that is going to help you put the power down to both wheels instead of those peg-leg, one-wheel feels of an open-style differential. Now, even though you guys are going to encounter a number of different options on the site and in the category, you're really going to boil down into two different categories. You have the positraction or posi disc, track locks or even the Torsen-style discs, all going to perform in the relatively same manner with slightly different design cues, and then you have the lockers. These things are going to be more aggressive, typically only used in all-out drag race applications, or even off-road use. They will be a little bit more noisy, and they will be rough around the edges for a streetcar. Now, you can technically add a spool into the mix for a third option, but we don't currently sell any for this particular gen. So we'll leave those out for this video. Now, those posis and track lock discs are going to be pretty much the same, in regards to design, as they're both clutch-based differentials, and they are going to be a little bit better suited for drag applications. The Torsen diff on the other hand is what's called a helical-style differential. There's no clutches anywhere. In fact, they're all gear-based. The general consensus is, for those, a little bit better suited for the road cars or even road race application, thanks to their high torque-bias and capabilities. So now that I've punished you guys with my not so eloquent way of describing the different types of differentials, let's talk a little bit more about Yukon Gear. Now, their Dura Grip is their posi option. It's going to be a step below their Grizzly Locker, also from Yukon Gear, in terms of overall aggressiveness. Now, you can check out that Grizzly on the site as well, if that's what you're interested in. The Dura Grip, on the other hand, a much more streetable differential. It's going to be a smoother operation, definitely a lot quieter compared to the locker, and it's a solid choice for any streetcar. But you can still take it to the track, still take it to the strip, beat on the car, thrash this thing, and it should handle the abuse just fine. Now, that Grizzly, the Locker, on the other hand, it's going to be a little bit more rough around the edges. What I mean by that is it's going to be noisier on the street, turns are a little goofy with the Locker, for those who have experience for that sort of thing. It's just not what I would recommend for an all-out streetcar. Now, if you're building a drag car, great. Check out the Locker. You'll definitely be happy. You can find that on the site. It will require 31-spline axles if you're interested, and it's definitely going to cost you a couple hundred bucks more than the Dura Grip that we have here. But focusing in more on the Dura Grip from a construction standpoint, again, this is a clutch-based differential, guys, meaning you're going to find some composite clutches in here, with the addition of four aggressive preload springs to help with the operation and send that power to both tires when needed. However, since it is a clutch-based differential, you can rebuild this thing when needed if those clutches do wear out on you after some years of abuse. Now, the case of this thing is made from nodular iron, very burly, as you might imagine. But the guts are actually made to take a beating as well. You're looking at forged steel gears with a special process to cut the teeth that makes them a bit stronger as well, which they can sometimes be a weak spot in these particular discs. Not so here with the Yukon Gear option. As far as your price point is concerned, well, high $400 mark is what you're looking at here, putting it in line with some of the Auburn stuff, in addition to the Eaton discs as well. Now, if you did want to step up to a Torsen, or maybe even a Locker, well, expect to spend a couple hundred bucks more, as we did discuss earlier in the vid. One thing to consider guys, if you're doing the differential, it's not a bad time to consider doing a new set of gears as well, if you've been thinking about it. You're going to be in there. You're cracking open the pumpkin. You might as well kill two birds with one stone. Obviously, that's going to increase the price, so you have to factor it in your budget. But if you do decide to build those new gears, just make sure you grab the necessary install and shim kit as well. Speaking of that install, I did decide to go a full [inaudible] three out of three wrenches on the difficulty meter here guys, anywhere from a couple of hours to a half a day in the shop or garage, depending on your expertise. Now, doing rear ends, gears, and things like that, it's an art form. Right? So if you're not really familiar with this kind of work, I would highly suggest taking this one to the local shop. Because improper installation of a gear set or diff can lead to some issues down the road. So the moral of the story here is, guys, if you don't know what you're doing, take it to the shop. If you do know what you're doing, well, then it's just another day in the garage for you. So wrapping things up, guys. If you're tired of those embarrassing one-tire fires and you want to put that power down to both tires, you'll have to check out the Yukon Gear Dura Grip posi, available here at

    Duragrip Posi Differential. Stop doing those ridiculous one wheel burn outs by upgrading to a Yukon 8.8in 28 Spline Duragrip Posi Differential from AmericanMuscle. A Limited Slip Differential (LSD) sometimes referred to as a "Posi" will allow both rear wheels to plant the power to the pavement giving you better traction and more impressive burnouts.

    Heavy Duty. Featuring a case constructed from nodular iron, this Yukon Gear Duragrip Limited Slip Differential boast forged 4320 steel internals and composite clutches for dependable heavy duty performance and long life.

    Application. This 8.8" Yukon Gear Duragrip Posi Differential will fit solid axle suspensions equipped V8 Mustangs from 1986 to 2004, including GT, Bullitt, and Mach 1 Models. Requires use of 28 spline axles. (Will

    not fit 1999-2004 SVT Cobra).

    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 Details

    MPN# YDGF8.8-28-1

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) 8.8" Limited Slip Differential
    Installation Info
    Tech Specs


    • 8.8" Limited Slip Differential
    • Heavy Duty
    • 10 bolt cover
    • Requires 28 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?
    • Bullitt - 01
    • 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
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 86

    Fits Mustangs equipped with a 8.8" rear end. Will not fit 1999-2004 SVT Cobras with the IRS.

      Customer Photos (1) Submit Your Photo

      View 1 Photo

        Questions & Answers (8)

        5 Top Rated Questions

        What all will I need to change with it? I ordered a new shim kit, just wandering what else I might need.

        • With the Yukon Gear Duragrip Posi Rear Differential we recommend replacing all shims and bearings. No other additional parts are required.

        Helpful (0)

        I can use the stock drive shaft with this?

        • This differential will work with the stock driveshaft.

        Helpful (0)

        is it 1, 1.5 or 2 way differential do you have any 1.5 way diff with 28 spline

        • The Yukon Gear Duragrip Posi Rear Differential is a 2-way differential.

        Helpful (0)

        Will this work on a 2003 v6 mustang?

        • This will not work on a 2003 V6 Mustang.

        Helpful (0)

        Will this product work on a 2003 v6 with a 28 spline?

        • The will not work on a 2003 V6 model Mustang regardless of the 28 spline.

        Helpful (0)
        Post Your Question
        3 More Questions
        About how much would it cost to have a shop install this? What would be a reasonable price? 1 answer
        Trac Lock switch Will this Differential still allow me to use my Trac Lock switch? 1 answer
        fitment will this fit on a 98 mustang v6 that has 28 spline 8.8in axles? 4 answers

          Customer Reviews (6) Write a Review

          Overall Rating 4.8

          out of 5 stars

          Installation Time:Weekend

          Installation Cost:$250-$500

          • Performance Gain 4.5 4.5
          • Fit 4.833333 4.8

          • 5/5

            Installation Time: Afternoon

            May 24, 2018

            Great lock up!!!

            Very easy to install and works better than expected!! No discernible change in handling in hard cornering.


            Year: 1997 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Weekend

            November 07, 2017

            pretty good diff

            the diff is a pretty good diff really had no problem installing it if you need to get the ring gear pressed on id recommend a shop do it for you also the bolts they give you arent with the kits arn't long enough.


            Year: 2002 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            February 28, 2017

            Great locker

            One of the best posi lockers for street applications or simple mods to get you moving faster


            Year: 2003 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $1000+

            June 20, 2014

            Superior product at a great price!

            I was impressed with the service leading up to the sell! Product was a great upgrade to my 2000 mustang GT. I will enjoy this product for years to come! Very durable build and you can see the quality!


            Year: 2000 Submodel: GT Jonesville, SC 29353, USA

            Helpful (6)

          • 4/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            November 26, 2013


            Well my stang is 13 years old and the rear diff was not working properly I ended up doing a couple of ridiculous one wheel burnouts and that is never a good sign specially when it comes to LSD. So I search around the Internet trying to find a solution and then I found This LSD 28 spline by YUKON at AM I love the grip the car handles much better throw rough cornering, lunches much faster than before overall is great I have grip all day long and I enjoy the 11 looking burnouts.


            Year: 2000 Submodel: GT Sabana Grande, 00637, Puerto Rico

            Helpful (11)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            July 09, 2013


            Needed gears done in my 99 Cobra and I bought this as an upgrade to the stock ford unit. I honestly didn't know what I was missing until this thing went in; talk about grip on all kinds of surfaces and horrible roads! If you are going to stick with the stock 28 spline axles then this unit is excellent bang for the buck at $350. I though I had grip before and I see how wrong I was, the Ford unit has nothing on this!


            Year: 1999 Submodel: Cobra Cambridge, UK

            Helpful (13)

          Related Mustang Categories