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Auburn Gear HP Series Limit Slip Differential - 28 Spline 7.5 in. (79-85 V8; 86-10 V6)

20 Reviews
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  • Item #22503
  • MPN# 542023

  • Market Price $527.99
  • You Save 9% ($48.00)
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  • Put the Power to the Pavement
  • Assembled 7.5" Limited Slip Differential
  • Requires 28 Spline Axles
  • High Performance
  • Accepts Tone Ring for ABS Applications
  • Fits 1979-1985 V8 and 1986-2010 V6
  • Made in the USA
Limited Slip Differential. Stop doing those ridiculous one wheel burn outs and upgrade to a Auburn High Performance Series 7.5in 28 Spline Limited Slip 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.

Application. This Auburn High Performance Series Limit Slip Differential will fit solid axle equipped V8 Mustangs from 1979 to 1985 as well as 1986 to 2010 V6 Mustangs. Requires 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 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 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 Details

What's in the Box
  • (1) Limited Slip Differential
Installation Info
Tech Specs
  • 7.5" Limited Slip Differential
  • 10 bolt cover
  • Accepts tone ring for ABS applications
  • Requires 28 spline axles
  • Requires 3 quarts Gear Oil
  • Requires 4 ounces of CM-19546-A1 friction modifier with initial fill
Will it fit my Mustang?
  • Foxbody - 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93
  • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10

Only fits Mustangs equipped with a 7.5" rear end

Most Helpful Reviews

nice addition to the family

pricey? yes! worth it? yes! works great with ford racing 3.73 gears and bbk upper and lower gripp control running 14.90's (1/4 mile) in my modified but still naturally aspirated 3.8 v6.

Helpful (1)

Nice Unit

I've looked everywhere for spider gears for my stock posi 7.5. Needless to say, I was unable to find what I needed due to the popular 8.8. I'm assuming this is the reason why this unit was so expensive ...

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Helpful (1)

Overall Rating 4.8 out of 5 stars
Read All 20 Reviews

JUSTIN: Hey I'm Justin with and this is our PowerPack Bolt-On Build-Up for all 99-04 V6 Mustangs. Now, before we get started, let's address the elephant in the room. From the factory, these 3.8 L V6s weren't the baddest Mustangs on the block, just in terms of all-out performance. But thanks to the large aftermarket support, and bolt-ons that can really squeeze every ounce of power out of any car, well these V6s can be turned into quite the competent little street-car. So that's exactly what we're going to show you here today. But before we get into it, we're going to grab a quick baseline number first just to see what we're starting with. Then we're going to hand the car over to the crew, to get everything installed. JUSTIN: Hey Mike, what's up man? MIKE: Oh, nothing much, man, what's going on? JUSTIN: It looks like we tackled some of the basics under here, I see that SR Performance Cold Air Intake, now obviously that's going to get us a little power of course, but maybe explain to us, maybe what else we can expect from using stuff like that? MIKE: Well first is price, it's a very budget-friendly piece. It's easy to install, looks great, it's no-tune required, and we should see some increase in miles-per-gallon too. JUSTIN: All right, cool, man. Now I notice a little yellow under the hood here as well, that's usually the calling card of Accel products. Tell us a bit more about this Super Coil Pack here. MIKE: You're going to get some horsepower & torque as well on this, but the main thing it's going to smooth out our idle, give us better drive-ability and give us a cleaner, hotter spark. JUSTIN: That's probably pretty important with an older car, such as this. MIKE: Absolutely. JUSTIN: Right on, man. Now I also know we've got the Pipes True Dual system on the car, that's been on for a little while, we're not going to lie, being car guys, this car didn't have much of a chance coming in here with a single exhaust. MIKE: Oh yeah. JUSTIN: So, talk about the benefits of a True Dual system on our V6. MIKE: It's going to increase horsepower and torque, more importantly for most of the guys, it's going to increase the sound, it's an aggressive sound, it's high-quality and it's also easy to install. JUSTIN: Now what's a Mustang without dual-exhaust coming out the back too, right? MIKE: Exactly. JUSTIN: Now, finally, I guess we can be safe to assume you're going to toss one of your custom Bama tunes into the mix? MIKE: Oh yeah. JUSTIN: Awesome man, now what's that going to do for us? MIKE: going to wrap all of our mods together, and make it a complete package. The fuel, the spark, the cooling fans, and being that it's an automatic, we're going to adjust the shift firmness, and the shift links. JUSTIN: Alright man, I guess there's only one more thing to do. You ready to see how much power this little 3.8's going to make? MIKE: Let's do it. JUSTIN: Alright. JUSTIN: So our baseline run with our 2006 V6 gave us 149 horsepower & 185 ft/lbs of torque. With our power pack installed we put down 163 horsepower & 192 ft/lbs of torque, giving us a peak horsepower gain of 14 over our baseline numbers, and gains of 15 horsepower and 15 ft/lbs of torque throughout the curve. Now it's obvious Mike was able to work his magic with the bolt-ons and the tune, but we wanted to give our V6 a little more giddy-up. So we installed a set of Ford Racing 373 gears along with Auburn's limited slip differential, now of course the gears are going to give us that increased acceleration we're looking for, but the diff's going to be equally as important. The limited-slip differential's going to distribute power to both wheels evenly, help us get off the line, and pull us out of the turns but, most importantly, no more embarrassing one-wheel peels. Alright, with everything wrapped up, let's get our V6 off the dyno and on to the streets so we can see how it does with all that new power, along with those acceleration goodies. JUSTIN: So we're back out in our 2000 V6, after the PowerPack's been installed, and we'll just get one thing out of the way, right away. Is our V6 faster than the GT500? Absolutely not, but that's not a big surprise. What I will tell you though, is that our V6 is significantly quicker all around. The acceleration pulls from, pretty much idle, all the way to redline now, as opposed to before, when it kind of fell on its face around 4000 rpms, 'cause it was just kind of being choked out by the single exhaust, and the puny intake. Now the intake is letting it breathe, the dual exhaust is really flowing well, sounds great by the way, for a V6, and the Bama tune's just really pulling it all together. Our acceleration, by the way, is killer. That Auburn LSD along with our 373s, have really made for one peppy daily driver. In the end, V6, much more improved driving experience. That's what we were going for with this Power Pack, and we really did a good job with our little 3.8 L here. So that wraps up our Power Pack for our V6 Mustang. Be sure to check out some of our other 99-04 V6 Bolt-On Build-ups, where we dress up our V6 a little bit, and work on our handling.

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19 Questions / 10 Answers

Ask a Question

Does this come with the gears? Does this differential come with gears? Will it fit a stock driveshaft? Do I need anything else to install this?


  • This LSD differntial does not include a gear set. You can reuse your factory gear set or you can upgrade if you'd like while the housing is open! You can use your stock drive shaft and nothing else is needed for installation aside from new rear gear oil!


    Good Answer (2) (1)

Show 2 more answers Question Resolved

28 spline axles I'm seeing that it requires the 28 spline axles. Does my 06 v6 have this already ?


  • Correct, your V6 Mustang came factory equipped with 28 Spline axles.This LSD will have you doing two wheel burnouts in no time! Great upgrade!!


    Good Answer (6) (1)

Show 2 more answers Question Resolved

2002 Mustang V6 Does the 2002 Mustang V6 has 28 splines? If not, what parts must I install to be able to install LSD?


  • Yes, all 86-10 V6 Mustangs came equipped with 28 spline axles from the factory. This would be a great addition to your Mustang, putting the power where it needs to be - the pavement! You won't be disappointed with this investment!


    Good Answer (5) (0)

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Customer Reviews (20) Write a Review

Overall Rating 4.8

out of 5 stars

  • 5/5

    Installation Time: Afternoon

    February 14, 2016

    nice addition to the family

    pricey? yes! worth it? yes! works great with ford racing 3.73 gears and bbk upper and lower gripp control running 14.90's (1/4 mile) in my modified but still naturally aspirated 3.8 v6.


    Year: 2001 Model: V6 Driving Style: Street / Strip 'Stangs I have owned: 3 indianapolis, IN

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    February 09, 2016


    Got this with 3 73 gears put in by a shop, took em 2hrs to get em put in ND only charged me 350$ to do it so It was pretty cheap. Bought it on cyber Monday for pretty cheap now I got both tires spinning instead of just 1. Only thing I heard the guys at the shop complain about was the c-clips in it being a pain to put in but besides that was really smooth


    Year: 2006 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 3 Waterloo, IL

    Helpful (1) (0)

  • 5/5

    Installation Time: Full Day

    February 14, 2015

    Nice Unit

    I've looked everywhere for spider gears for my stock posi 7.5. Needless to say, I was unable to find what I needed due to the popular 8.8. I'm assuming this is the reason why this unit was so expensive but it was either buy the unit or run my stock unit with burnt up spider gears. The only issue I ran into was not knowing that I would need C Clip eliminators. Other than that, this unit works as advertised. I just wish it didn't cost 2x as much as a unit for a 8.8.


    Year: 1984 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 Clarksville, TN

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    June 10, 2012


    First off this is a must have. I cant get that stupid smile off of my face still. It puts down power more evenly and helps when your taking off as well, oh and the sweet two wheel burnouts! Its a great mod and a must have for ALL V6 owners! However it is a bit pricey, compared to the old ford one, which is not being made anymore. It is expensive but totally worth it! While your down there get a rebuild kit with everything you need in it! Overall, I am SUPER happy i got this! Thanks AM! Hope I helped everyone!


    Year: 2001 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 2 Brookfield, CT

    Helpful (19) (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    August 10, 2012

    tons of grip

    completely changes the car's handling and makes it move through a turn. It's definitely an expensive unit but since it's good for more power than any sixer anywhere can make n/a, it will last a good long time and is worth it. This, paired with a nice set of gears will wake up anyone's six.


    Year: 2003 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 NJ

    Helpful (9) (1)

  • 5/5

    Installation Time: Weekend

    December 15, 2012

    V6 Stang LSD

    Absolutely love this product with the auburn LSD and the 4.10 Ford Racing gears makes a huge difference in the drivability of my car it squeezes every last horse out of your v6. You can feel the biggest diferance is right off the line, and between 3 grand and 5500 rpms. The description says it ands 5 hp but it feels close to 100. I would definitely recommend these two together to anyone with a v6 that's looking to put a little pep in its step. O best of all no more one wheel peels!!


    Year: 2001 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 Vincennes, IN 47591, USA

    Helpful (5) (0)

  • 5/5

    Installation Time: Afternoon

    January 19, 2013

    This product is a must for street or drag for Mustangs!

    We removed the stock gears and installed the 3.73 gears with Auburn Posi-Torque in four hours on an 02 Mustang. We renewed the rear brake pads at the same time. We also had to re burn the computer chip to obtain the correct speedometer reading. The total performance was noticed immediately with improved shifting through the automatic transmission. We highly recommend this product. Al Chornyi


    Year: 2002 Model: V6 Driving Style: Street / Strip 'Stangs I have owned: 1 Vancouver, BC, Canada

    Helpful (4) (1)

  • 5/5

    Installation Time: Full Day

    June 18, 2013

    very nice

    this product is amazing went in easy and works great. amazing quality. no more one tire fire burn outs and great launches.


    Year: 2000 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 Idaho, USA

    Helpful (2) (0)

  • 5/5

    Installation Time: Full Day

    May 13, 2013


    This is one of the best upgrades I've done to my stang. I can feel the power being planted to the pavement. A little pricey but worth every penny.


    Year: 1996 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 Texas

    Helpful (2) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    March 23, 2013

    no more one wheel peel

    Having prior knowledge of a rear end, puttin this in with the 3.73 gears, my car definitely picks up much better! And with the two tire marks instead of one, this little sixer is definitely more fun to drive around! It is a must!


    Year: 2004 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 Omaha, NE, USA

    Helpful (2) (0)

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