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Ford Performance Friction Modifier (79-14 All)

Market Price $12.99 You Save 15% ($2.00)
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$10.99

FREE Shipping on orders over $49

  • Item 50377

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    Features, Video & Details

    • Perfect for Gear Swaps
    • Reduces Gear Whine and Chatter
    • 3.8 fl oz Bottle
    • For All 1979 to 2014 Mustangs

    Review & Installation Video

    Review & Install Video



    Perfect For Gear Swaps. Ford Racing's Friction Modifier is a specially formulated additive to provide smooth operation of clutch-type limited-slip differentials, perfect for gear swaps.

    Legendary Ford Racing Quality. When you're adding performance parts to your Pony, you can't go wrong by installing parts from the folks that know it best. Ford Racing's legendary quality ensures years of hassle-free use.

    Application. Ford Racing Friction Modifier is recommended for use in 1979 to 2014 Mustangs and is compatible with other brands of gear oil. One bottle is required for rear ends equipped with Ford traction-lock units.

    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 2011 2012 2013 2014 Details

    MPN# M-19546-A12

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    What's in the Box
    • (1) 3.8 fluid oz bottle
    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, 13, 14
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 79, 80, 81, 82, 83, 84, 85, 86
    • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14

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    Questions & Answers (8)

    5 Top Rated Questions

    I have a 2014 GT premium 5.0 with an automatic. Would you recommend the use of this product when changing the gear oil? Thank you.

    • We do recommend using friction modifier when changing your Mustangs ger oil!

    Helpful (7)

    Application I've scoured the internet looking for recommended methods of application and found nothing. Do I apply this gear by gear with a brush or do I just toss this in at the same time with the diff fluid?

    • It's designed to be poured directly in to transaxle case using a limited slip differential also referred to as a "Posi" meaning both wheels spin when power is applied. I would suggest pour entire bottle in first then pumping in your new fluid fill just below the fill hole plug. Check your year and model for specfication on filling level and fluid requirements. You may notice a faint noise from the differential for a few days until the new fluid and additive impregnate the clutch pads and it will go away nothing to worry about.

    Helpful (2) Show 1 more answer

    2007 GT 8.8 Rear axle My problem: only one wheel spins in high throttle. The clutch slips. Is this a thing that prevents clutch slip? Or is it only the noise that is reduced?

    • Unfortunately Ford Performance Friction Modifier is used to provide additional lubrication to the gears in the differential, however it would not prevent clutch slip. Clutch slip is usually the result of the clutch and flywheel unable to transfer torque to the drive-train. The only solution would be to replace the clutch and flywheel in most cases. Feel free to give our customer service department a call if you have any additional questions!

    Helpful (1)

    Can i add this to my car without having done a gear change or replacing the gear oil

    • I would not recommend adding Ford Performance Friction Modifier unless you are changing your gear oil, it is added in as a ratio with gear oil.

    Helpful (1)

    This friction modifier is good just for differentials or you can add when you change gear oil in gear box to

    Post Your Question
    3 More Questions
    Hello I have smal gear whine between 40-60 mls help this product? maybe 2 bottles 1 answer
    Is friction modifier good for a manual transmission gear box? 1 answer
    do i need to use this stuff i swapped gears about 1 year ago and used friction modifier.....i want to change rear end fluid now...do i need to use the friction modifier ??? thanks 1 answer

    Recommended For You

    Customer Reviews (68) Write a Review

    Overall Rating 4.8

    out of 5 stars

    Installation Time:Less than 1 Hour

    Installation Cost:$100-$250

    • Performance Gain 4.538462 4.5
    • Fit 4.907692 4.9



    • 5/5

      Installation Time: Less than 1 Hour

      April 23, 2019

      Must have

      You need this if you get the clutch and shim rebuild for your rear end to soak the carbon fiber clutch disks!

      ChaseG

      Year: 2013 Submodel: GT

      Helpful (0)

    • 5/5

      March 25, 2019

      Recommended? Yes. Works? Yes!

      This lube additive is supposed to let a differential work without making a bunch of noise from what I read. Okay, I used it and guess what? No crazy noises!

      TheRAP

      Year: 2007 Submodel: V6

      Helpful (0)

    • 4/5

      March 24, 2019

      Best price on the internet!

      Bought a gasket, gear oil and the Ford Performance Friction Modifier for the best combined at American Muscle

      TeamUgly

      Year: 1996 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      March 23, 2019

      Does what it should

      Works good and does what it should. C any go wrong with Ford performance friction Mod.

      Swoopty5525

      Year: 2007 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      March 18, 2019

      GREAT ADDITIVE

      Great product for all semi-posi's and positraction rear gears. Ford racing lubes work perfect

      MichaelP

      Year: 2013 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      March 08, 2019

      Best friction modifier

      The best friction modifier on the market today. Let clutch packs soak overnight smells horrible but works the best .

      Lurch904

      Year: 2007 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      February 11, 2019

      Must use!

      A Must for Posi trac type rear axels. Use only the manufacturer's name brand posi additive. Others may not perform as well. Install additive before the remainder of the rear end grease, to insure that you have room for it.

      Fordman

      Year: 2006 Submodel: GT

      Helpful (1)

    • 5/5

      January 25, 2019

      Great product

      I needed it for my gear swap, local speed shops were charging $30 for this

      Drew

      Year: 2005 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      January 16, 2019

      Great stuff

      Bought on sale at a great price,shipped fast and works well..

      mustangdave

      Year: 2002 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      January 16, 2019

      gear oil

      This has been helping me to get off the line with both wheels pushing my limited slip rear end. great product and fast shipping.

      toby

      Year: 1995 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      January 04, 2019

      Friction Modifer FP

      I highly recommend purchasing this along with your diff. Fluid! Great product!

      BradleyL

      Year: 2007 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      December 27, 2018

      The right stuff

      This is the proper additive for your rear gear assembly. Pick up a bottle and change your fluid every 30k miles

      HeadbangerGT

      Year: 2010 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Less than 1 Hour

      December 26, 2018

      Just in case

      Doing a whole rebuilt on my IRS. The diff fluid I am using doesn't call for modifier but I threw in a 4 oz. just in case to eliminate all possibilities of chatter. Keep in mind if you use RTV for a gasket, let it sit and cure before adding fluid to the diff.

      StuartC

      Year: 2004 Submodel: Cobra

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      December 22, 2018

      noises all gone.

      this is all you need to add to your rearend.it got rid of my wineing .

      nickb

      Year: 1993 Submodel: LX

      Helpful (2)

    • 5/5

      December 14, 2018

      It works.

      The item works. What more can I say about friction modifier. it did the job for a good price.

      RichardB

      Year: 1995 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      October 20, 2018

      GaryP

      I put this Friction Modifier in my rear end when I change the gear oil

      GaryP

      Year: 2011 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Less than 1 Hour

      October 04, 2018

      I did what I was told

      The tech said it would be a good idea to add it and it wasn't expensive or anything so I added it with the diff oil.

      73challenger503

      Year: 1998 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Less than 1 Hour

      September 20, 2018

      Whine is gone!

      Amazing product, I was worried that something was wrong with my gears because it was whining and they told me about this and it took the whine right away!

      Oscar23

      Year: 2011 Submodel: V6

      Helpful (5)

    • 5/5

      Installation Time: Afternoon

      August 16, 2018

      Royal Purple A

      Obviously Royal Purple is the best in lubrication. Same with Ford Performance Parts; they're stuff just works well. OEM! No complaints. When you buy the best products you get the best results.

      TimothyW

      Year: 2006 Submodel: GT

      Helpful (7)

    • 5/5

      July 09, 2018

      Helps the clutch packs function and stay quiet

      Filled this up with my gear oil after putting a new LSD in my rear end, and it seems to be doing its job since it’s operating nice and smoothly without any noise or chattering. A must-have for anyone with an LSD that uses clutch packs!

      ScottG

      Year: 2006 Submodel: GT

      Helpful (7)

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