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Ford Performance FR500S Differential - 31 Spline 8.8 in. (11-14 V6; 86-14 V8, Excluding 13-14 GT500)

Market Price $881.99 You Save 12% ($102.00)
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  • Item 50300
  • MPN# M-4204-T31H

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    Features & Details

    • Used in the FR500S Race Car
    • Type T-2R Torsen Differential
    • High Bias Ratio of 4.0
    • Preloaded Clutch
    • Perfect for Street or Track
    • 8.8" Differential
    • Requires 31 Spline Axles
    • Fits 1986-2014 V8 and 2011-2014 V6, Excluding IRS Models
    FR500S. Does your factory rear end just leave you spinning your wheels? Then upgrade to the same exact differential used in the Ford Racing "FR500S" race car. This limited slip differential (LSD) uses a worm gear friction system that ensure your engine's power is transferred to the wheels for maximum traction.

    Torsen T-2R Differential. Built off the T-2 differential, the Torsen T-2R uses friction enhancing plates that allows for improved mobility and traction even under the most extreme conditions. The T-2R is always active and responds instantly to torque feedback from all driving conditions.

    Application. This Ford Racing FR500s 8.8" Differential will fit solid axle V8 Mustangs from 1986-2014 and 2011-2014 V6 Mustangs. Requires 31 spline axles.

    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.

    Specifications:
    • 8.8" Limited Slip Differential
    • Preloaded Clutch
    • Will accept anti-lock exciter ring
    • Requires 31 spline axles
    • Requires 3 quarts Gear Oil
    • Requires 4 ounces of CM-19546-A1 friction modifier with initial fill
    • Fits solid rear suspension
    • Does not fit IRS applications

    Technical Note. You will need to reuse your factory 8.8” gear set, or upgrade to a new set of our 8.8" 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: 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
    • (1) Limited Slip Differential
    Installation Info
    Tech Specs
    Will it fit my Mustang?
    • Boss 302 - 12, 13
    • Bullitt - 01, 08, 09
    • 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, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
    • GT500 - 07, 08, 09, 10, 11, 12
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 86
    • V6 - 11, 12, 13, 14

    Requires 8.8" rear and 31 spline axles. Does not fit IRS applications

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    Questions & Answers (6)

    5 Top Rated Questions

    Will this be good for drag racing while still maintaining streetability?

    would this product also work for a 2010 v6 mustang if i changed the axles to the appropriate 31 spline 8.8 inch axles

    • The Ford Performance FR500S Differential would require you to remove the 7.5" rear, and install an 8.8 rear with 31 spline axles.

    Helpful (0)

    I see 2.0 2.7 4.0 etc. for the bias... What does this mean? the amount of slip? what would help me out more if I say had one wheel up in the air and needed the other cause my wife put the car in a ditch?

    • The Bias Ratio is the amount of torque the differential can send to the wheel with more traction compared to the one with less. For example, if your car was put in a ditch, this differential would be able to send 4 times as much torque to the wheel that is on the ground than to the one that is in the air. So, this differential would definitely get more power out of the wheel that's on the ground instead of wasting power on the one that's in the air.

    Helpful (0)

    do you need to change out your axle bearings and seals when installing this part? thanks ! Do you have to pull out your axles when installing?

    • With the installation of the Ford Performance FR500S Differential - 31 Spline 8.8 in.the axles will need to be removed for proper installation. But the axle bearings will not need to be changed unless they are leaking.

    Helpful (0)

    Will this go good with a sn95 GT ? I have a few bolt on and in currently Rebuilding my transmission with a complete beefed up kit Along with the torque converter . I'm swapping out the rear end as well and Installing a 4.10 . Will this be to much ? Or will this be okay.

    • As long as you SN95 GT is 31 Spline and 8.8 in axle, then the Ford Performance FR500S Differential - 31 Spline 8.8 in. (86-14 V8; 11-14 V6) will work no problem!

    Helpful (0)
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    People Who Bought This Item Also Bought

    Customer Reviews (10) Write a Review

    Overall Rating 4.9

    out of 5 stars

    Installation Time:Weekend

    Installation Cost:$250-$500

    • Performance Gain 5 5
    • Fit 4.9 4.9



    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      July 21, 2018

      FR500S Diff

      Amazing product. Worth the money. Noticeable difference when even regular driving. Love pushing the car more in twists and turns. Can't wait to try out in the next autox season. One of the few things I didn't trust myself to install. If you don't know whether you can install or not watch Eric the car guy on youtube work on a Ford 8.8.

      TimothyN

      Year: 2003 Submodel: Mach 1

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      February 22, 2018

      Awesome!

      I notice the difference on the first corner leaving the shop. The rear feels like it rotates some much better.

      DarrenF

      Year: 2007 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      July 29, 2017

      Definitely an upgrade!

      Mustang handles in twisties soooo much better! Install was straightforward, no hassles, everything bolted right up and fit great.

      DerickP

      Year: 1992 Submodel: LX

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      July 28, 2017

      HOLY COW!!!!!

      WOW!!! I had high hopes for this part, but I really didn't understand the level of performance that this provides. I RARELY write reviews on products unless they are really bad or really good. I use my 14 GT for fun, it is not a daily driver. I have lots of suspension mods. I will give the short list: Watts Link, Upper and Lower control arms, Koni yellows, front sway bar, relocation brackets. All but the Koni's are BMR. This car is stiff and had the ability to go around a turn at a very high level with my Nitto NT05's for grip (amazing as well). When negotiating a turn, there is a point where you could tell that the factory rear end was stressed and at it's limit. FR500S to the rescue...while pushing through a turn now, the Mustang is just asking for more and more. Very hard to explain, the car just curves through the corner now, allowing me, the driver, to push harder and harder. The limits I haven't found yet due to my pucker factor, lol. Strongly suggest this modification is you have a road coarse car, you will not regret it. WOW!!

      WadeW

      Year: 2014 Submodel: GT

      Helpful (4)

    • 5/5

      June 22, 2016

      Way better than the Trak-Lok

      After installing this, I've noticed a substantial reduction in understeer. Powering through a corner makes it feel like the rear axle is steering too. Incredibly confidence inspiring, not just on the track, but on the street too, dry or wet. The diff is very quiet and has smooth, fast, and predictable operation. This also doesn't have clutches to wear out, so if you're on the fence between this or a trak-lok, this one is the only way to go, unless you're strictly into drag racing.

      Andrew

      Year: 2006 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Weekend

      December 23, 2014

      Best money ever spent on a mod

      Car handles completely different. No longer clumsy around corners. Transfers every bit of torque from the driveshaft to the wheels with wait...here's the key "perfect instintaious differential action". Theriatically a zero wear item. This is the most ingenious LSD available. I am a repeat offender(customer) and this is by far the best money I have spent to date. It's no wonder these torsens come standard on the track pack 2015 mustangs and the earlier boss'. I wonder why those cars put down the best circuit and drag times compared to other variants?

      NicNak

      Year: 2007 Submodel: GT Killeen, TX, USA

      Helpful (4)

    • 5/5

      Installation Time: Weekend

      October 01, 2014

      Excellent product

      Installed the FR500S this week along with new 3.55 gears and aluminum drive shaft. Still breaking in the gears, etc., so I don't have performance input at this time. The install went really well and the quality of the unit was excellent. Compared with the original differential this Torsen unit is a big improvement. It was installed in a 2011 3.7 that has twin turbos and loads of torque (in excess of 400 ft pounds to the wheels). Should hook up a lot better out of the corners now.

      MUSTANGTT

      Year: 2011 Submodel: V6 DFW Metro

      Helpful (5)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      August 08, 2013

      T2R differential

      If you auto cross or road race your mustang this is a must have. I went from the T2 to the T2R and my inside wheel spin issues seem to have vanished. If you're on the fence between the two, I'd go with the T2R and be done with it.

      JohnH1775

      Year: 2011 Submodel: GT Blythe, CA, USA

      Helpful (10)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      May 26, 2013

      Wow! This is a must for some people....

      I recently had this differential installed when the stock one was burned up from too much use with R-comp tires. The car now puts power down out of turns incredibly well, and it rotates like never before. It took me by surprise the first time I took a corner after I'd picked the car up. If you do any track or autocross work- look no further. Slicks WILL toast the stock diff. The torsen has no clutches to rebuild, so it *should* be a zero-wear item! Expensive price of entry, but worth every penny IMO. Get it now!

      csamsh1

      Year: 2012 Submodel: GT Oklahoma City, OK, USA

      Helpful (6)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      April 28, 2012

      Let's Go Racing

      Had my new FR 500S Differential installed in my 2012 Mustang GT. Took my car to the track at Buttonwillow Raceway near Bakersfield, Ca and it had tremendous hook up both in the turns and the straights. My ability to pass other cars increased and it was and absolute pleasure to drive at the track and to and from the track. I would highly recommend this upgrade to anyone wanting to put more power to the pavement. It feels as if the differential spins much more freely than before as if there is nothing dragging or hindering it at all. Like your getting free horsepower.

      BLee403

      Year: 2012 Submodel: GT So,Cal

      Helpful (12)

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