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Yukon Gear Duragrip Posi Rear Differential; 28-Spline 8.8-Inch (86-04 V8 Mustang)

Item 21611
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      Video Review & Installation

      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

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation

      Features & Specs

      • 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)


      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.

      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.



      Yukon Gear YDGF8.8-28-1

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) 8.8" Limited Slip Differential


      Customer Reviews (36)

        Questions & Answers

        10 More Questions

        Will It Fit My Mustang

        • Bullitt - 01
        • Cobra - 93, 94, 95, 96, 97, 98, 99, 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.

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