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Yukon Gear DuraGrip Posi Rear Differential - 28 Spline 7.5 in. (79-85 V8; 86-10 V6)

Item 386419
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    Features, Video & Details

    • Put All Your Power to the Pavement
    • Assembled 7.5" Limited Slip Differential
    • Heavy Duty - Nodular Case with Forged 4320 Internals
    • Composite Clutches Included
    • Requires 28 Spline Axles
    • Fits 1979-1985 V8 & 1986-2010 V6 Mustangs

    Review & Installation Video

    Review & Install Video

    Hey, guys. Stephanie with here with this Yukon Gear DuraGrip Posi rear diff for 28 spline 7.5 rears, or to break it down, '79 to'85 V8s and '86 to 2010 V6 Mustangs. This Posi unit from Yukon Gear is going to be a good option for the guys out there with a seven-five rear that are looking to replace their diff with an upgraded one that is a stronger, true Posi unit. This diff has composite discs and requires the use of 28 spline axles, which means that you don't have to upgrade over the factory units. This diff will get your car away from one wheel burnouts and give you a solid upgrade that's going to hold up better to more aggressive driving. There are a couple of reasons to change or upgrade your differential. The first one is to move to a true Posi unit, so you have a consistent dual wheel spin instead of a single wheel spin. Another thing to consider is maybe you've got a stock diff and it's just getting old and 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. But no matter what your reason is, this Yukon Gear diff is upgraded and it's slightly beefed up, and it's a quick solution to help you get power to the pavement through a true LSD setup. If we take a step back for a minute, the point of a limited slip differential, or LSD like this one here, is to allow both rear wheels to put power to the ground and get 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 it's forward momentum, the LSD is designed to eliminate that spin. It'll transfer the torque of both rear wheels evenly, which 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, no slipping, more durability, gentle transitions and even a quiet operation. I'm saying that this diff is a heavy duty diff because of features like the nodular case. The case is constructed from nodular iron, but more importantly, this diff also has forged 4320 steel internals and composite clutches. These are upgraded items that mean the diff will be dependable under aggressive driving, and in more of a heavy duty performance life. This also means a longer life span. The composite discs that I'm talking about here are the discs that are in the clutch pack, and the clutch pack is what activates the LSD. And more specifically, the clutch plates create the locking performance of the LSD that I spoke about earlier, so it's important that they will hold up to the spinning [SP] end. Like I mentioned earlier, this diff is going to require the use of 28 spline axles, which is the spline count that the 7.5 rear comes from the factory with, so you aren't looking at having to upgrade your axles with this diff, which is nice. It's one less expense that you'll be facing when you're ready to move up to a diff like this. This is going to work for cars with a solid axle setup, and you'll need to reuse or grab a new seven-five rear gear set. This does not come with new aftermarket rear gears. One other note would be the recommended use of 75W90 rear gear oil, since this'll give you the same oil weight as factory, and you're going to need three quarts of that and four quarts of friction modifier for the initial fill. When it comes to price, this rear diff is going to cost just over $400. It's actually one of the only two rear diffs for the seven-five rear that are currently available on this site, and it's a little more wallet-friendly of the two options. There is always the other option of upgrading to an eight-eight rear and 31 spline axles if you have the torque and power to justify that, but that's most likely going to be a little bit more expensive depending on which setup you choose to go with, and considering the other items that you'll need to make the switch complete. As far as the install, you're going to need some experience with this one. You 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. Another thing to consider here are proper tools like a dial indicator, bearing pullers and press, pinion nut socket, ring gear bolt socket and items along those lines just to avoid any part damage. You're looking at about four hours time and a three out of three wrenches on the difficulty meter. Going over a general install, 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 cover, so you'll need something to drain into. The axles will need to be pulled out of the diff, and the diff will need to be removed. The shims that are on each side of the diff bearings will need to be installed the exact same way, so keep track of those. You're looking at some diff assembly adjustments, such as pinion depth, pinion bearing preload, backlash and carrier bearing preload, and also some seal prep. Then you'll have a pinion trial assembly, an initial carrier assembly, followed by adjusting the backlash. And backlash is the amount of ring gear that can rotate forward and backwards when the pinion gear cannot move.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 if you wish to install this for yourself or take it to a shop. Wrapping things up here, Yukon Gear Posi rear diff is a seven-five rear diff that gives you an LSD setup with composite discs that's going to use with 28 spline axles. It's an upgrade over the factory diff, and this diff is a good option for those looking for a maintenance replacement or those looking for something to make sure that you can get some extra torque planted squarely to the ground. And you can check it out some more right here at

    Duragrip Posi Differential. Stop doing those ridiculous and humiliating one wheel burn outs by upgrading to a Yukon 7.5in 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 7.5" Yukon Gear Duragrip Posi Differential will fit solid axle equipped Mustangs, including 1979-1985 V8 and 1986-2010 V6 models. Requires use of 28 spline axles.

    Application Note: 1979-1985 V8 and 1986-2010 V6 Mustangs came factory equipped with 28 spline axles.

    Technical Note. You will need to reuse your factory 7.5” gear set, or upgrade to a set of our 7.5" 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: 1979 1980 1981 1982 1983 1984 1985 1986 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 Details

    MPN# YDGF7.5-28

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) 7.5" Limited Slip Differential
    Installation Info
    Tech Specs


    • 7.5" 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 axle rear suspension
    Will it fit my Mustang?

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        Questions & Answers (24)

        5 Top Rated Questions

        So does this come with everything I need (i know to re-use my gears) by will I have to buy anything else to complete installation on a stock 07 mustang v6

        • You will not need to purchase anything additional to this differential. However, we would recommend purchasing the bearing and installationkit to upgrade those parts as well. 

        Helpful (2)

        So do I have to get new gears just to use this or will it fit right in with the stock gears

        • The Yukon Gear DuraGrip Posi Rear Differential will not require new gears for this to be used no.

        Helpful (1)

        About how much power will this withstand?

        • The Yukon Gear DuraGrip Posi Rear Differential uses a Nodular Case with Forged 4320 Internals, providing it with a great amount of strength. The axles and axle housing will fail before the differential has issues.

        Helpful (1)

        I have a 1999 V6 which will soon be undergoing a complete overhaul using all new performance parts. I'll most likely be getting around 340 to 350 hp to the wheels when finished. Will this part be able to withstand that kind of power coming from the modded 3.8L?

        • The Yukon Gear DuraGrip Posi Rear Differential will absolutely be able to withstand that kind of power.

        Helpful (1)

        Hi Guys i have a 2005 V6 Auto it has only 34000 miles on it, with quite a few mods Exhaust cai Flash four tune running a 93 octane tune , so this is all i need , and will it tie all my mods up nicely and get me of the line a tad faster ruining 0-60 mph at 6.2 secs at the mo

        • Unless your old differential was somehow "bad" enough to have caused to you have lost any power, the installation of this differential isn't exactly going to offer an gains. Being heavy duty, it will be able to handle a beating better and last longer if you will be putting your 'Stang through the ropes.

        Helpful (0)
        10 More Questions
        Will this fit a 1997 mercury grand marquis with the 7.5 differential? 1 answer
        Is this differential Rebuildable? 0 answer
        What tipes of gears would you recommend to instal with this differential? 1 answer
        Does the TCS can still be used once I install a LSD? 1 answer
        Thinking of this mod with 4:11 gears upgrade as well. Will I need a new tune with this? 1 answer
        Is the differential good for daily driving, or would a less agressive one be better? 1 answer
        The 2.3 L Foxes came stock with a 7.5 in. rear end, would this work in that rear? 1 answer
        i have a 2010 v6. i would like to replace my differential, would i need anything in addition to this? what kind of gears would i need? 1 answer
        I have a complete rear end out of a 2007 Ranger 7.5 open. Will this fit? 1 answer
        does my 07 mustang v6 already have 28 spline axles ?? 1 answer

          Customer Reviews (19) Write a Review

          Overall Rating 4.7

          out of 5 stars

          Installation Time:Weekend

          Installation Cost:$100-$250

          • Performance Gain 4.647059 4.6
          • Fit 4.882353 4.9

          • 5/5

            August 31, 2019


            Works well with the performance program Perry Sharp of Oregon installed.


            Year: 2003 Submodel: V6

            Helpful (1)

          • 5/5

            November 12, 2018

            GOOD LSD



            Year: 2007 Submodel: V6

            Helpful (2)

          • 5/5

            Installation Time: Shop Install

            March 21, 2018

            Yukon differential w/ 3.73 gears

            I recently had a Yukon posi differential w/ 3.73 gears installed in my '08 V-6. I waited until after the break-in period was completed before testing it out. The car has much better acceleration at highway speeds than the stock rear end. And, it's much quicker off of the line! I'm going to research a tuner next because my speedo is approx. 5 mph off. My mechanic shop decided to ship the rear to a specialty shop for the gear work.


            Year: 2008 Submodel: V6

            Helpful (3)

          • 5/5

            Installation Time: Full Day

            September 15, 2017

            My oh my!!

            Installed this beauty along with my Motive Performance Plus 4.10 Gears (05-10 V6). I gotta tell ya, I is a game changer. Goodbye to the ridiculous fishtailing when there's a few snow flurries on the road. Get's that power right down there where it's supposed to be. Sounds corny but, after installing this LSD I can feel the road under me better, more control in the turns and it kicks off much better than it ever did before. Totally worth the money.


            Year: 2008 Submodel: V6

            Helpful (12)

          • 5/5

            Installation Time: Weekend

            September 05, 2017

            Great part

            Dura grip posi works great no other parts needed except a shim kit if you break one like I did putting the rear diff in.


            Year: 2002 Submodel: V6

            Helpful (8)

          • 5/5

            August 24, 2017

            posi rear diff

            it's great!! both wheels finally spin for better launch. pretty straight forward to install.


            Year: 2005 Submodel: V6

            Helpful (7)

          • 5/5

            June 21, 2017

            Must for V6's

            When I first bought my Mustang I overlooked the fact that it had an open differential. Many (older) trucks have open diffs and perform fine, so why shouldn't the mustang? Wrong. I think that this should be one of the first mods any 05-10 v6 owners should consider. I no longer have to worry about my car being tail happy, doing the one wheel peel off the line, or being extra careful on wet/uneven surfaces. My performance has improved drastically, especially coupled with 3.73 gears. If you're tired of spinning one tire or take your car to the track this is a must!


            Year: 2007 Submodel: V6

            Helpful (10)

          • 5/5

            April 16, 2017

            Yukon Posi Rear Diff

            Great posi unit. I paired these with 3.73 gears from Yukon as well. I do have to say it let's u lay the rubber to the ground like nothing else. I have not yet tried to leave dual burnouts but my guess is ull get more grab and go then you will squeel and stay. All in all I'm so glad I bought this with the 3.73 gears.


            Year: 2007 Submodel: V6

            Helpful (8)

          • 5/5

            Installation Time: Weekend

            March 23, 2017


            This project took the whole day. I love the way my car runs now with the differential


            Year: 2003 Submodel: V6

            Helpful (7)

          • 5/5

            August 29, 2016

            Posi gear

            The product is very good if you want to have your car put down two tires on the streets, not just those one tire spinning


            Year: 2000 Submodel: V6

            Helpful (6)

          • 4/5

            July 11, 2016

            Super grip

            Pretty awesome part esp when paired with new gears RP gear oil and ford racing friction modifier love the way it feels but not a fan of the noise sounds as if the pinion depth is off got it done in the shop too smdh would've done it myself but my car is a daily


            Year: 2008 Submodel: V6

            Helpful (10)

          • 5/5

            Installation Time: Weekend

            June 07, 2016

            Layin down the power

            After I had my Yukon Posi and 3.73 gears installed I noticed a huge difference in my mustang! You really can feel the power to the pavement when you hit it! Leaving dual strips is way cool too! Definitely worth installing in your car!


            Year: 2002 Submodel: V6

            Helpful (7)

          • 1/5

            Installation Time: Shop Install

            May 20, 2016

            installed not even an year

            I had it installed not even an year ago...and the spider gears are already broken...if you have high performance upgrades on your car you might as well change your rear end as well...the spider gears will not hold up...


            Year: 1999 Submodel: V6

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            September 25, 2015

            Great Part

            A great part for your v6. Get rid of that one burn out for a v8 show!


            Year: 1998 Submodel: V6 Southaven Mississippi

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            September 18, 2015

            GAME CHANGING

            At first I didn't think that this part would make a big difference but I did! You get such a faster launch off the line than ever before. This paired with some 4.10 ford racing gears will have you showing the GT's that you are just as good as them! Oh and you can't forget about being about to do the TWO wheel burnouts now! Simple awesome


            Submodel: V6 Missouri

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            September 18, 2015

            One Word... Traction

            Traction is increased greatly with this mod. Plus I love the 2 wheel burnouts! If you plan to mod your stang even a little I would recommend this. Installed it with ford racing 4.10 gears and it sure put a smile on my face!


            Year: 2006 Submodel: V6 Bridgeport, WV

            Helpful (11)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: 0-$100

            August 16, 2015

            Great traction gain

            $0-100 because I live in the border so I just crossed it and installed it professionally. Cheap for what it does, great traction control gain. And good burnout to show off. Overall 5 star.


            Year: 2010 Submodel: V6 Laredo,tx

            Helpful (6)

          • 5/5

            Installation Time: Shop Install

            June 11, 2015

            Yukon diff

            Gives the v6 mustang the true mustang feel with both rear tires moving. It will take you by surprise. I suggest everyone who has not purchased and installed it. To get it.


            Year: 2004 Submodel: V6 VA

            Helpful (8)

          • 5/5

            Installation Time: Afternoon

            June 01, 2015


            Having a posi diff is sooooo much better than stock. I no longer have do worry about pulling a 1 wheel peel!


            Year: 2010 Submodel: V6 Nova Scotia, Canada

            Helpful (5)

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