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Ford Performance Friction Modifier (79-14 All)

Market Price $11.54 You Save 5% ($0.55)
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$10.99

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  • Item 50377
  • MPN# M-19546-A12

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Ship to: Ashburn - 20149
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    Features & Details

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


    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

    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 (7)

    5 Top Rated Questions

    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)

    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 (1) Show 1 more answer

    Hello I have smal gear whine between 40-60 mls help this product? maybe 2 bottles

    • This would reduce gear whine and chatter, I would advise just using one bottle unless you are doing a full gear swap. 

    Helpful (0)

    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 (0)

    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 (0)
    Post Your Question
    2 More Questions
    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

    People Who Bought This Item Also Bought

    Customer Reviews (54) Write a Review

    Overall Rating 4.8

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:$100-$250

    • Performance Gain 4.568627 4.6
    • Fit 4.921568 4.9



    • 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 (0)

    • 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 (4)

    • 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 (4)

    • 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 (4)

    • 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 (6)

    • 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 (6)

    • 5/5

      June 07, 2018

      Different FM

      Added to my Royal Purple gear oil. Delivered in a short time at a good price.

      Woody

      Year: 2012 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Less than 1 Hour

      May 27, 2018

      Does what it says

      Seems to be doing what it says. I can’t say anything good or bad about it. Seems like you need it so use it.

      Brian

      Year: 2008 Submodel: GT500

      Helpful (6)

    • 5/5

      Installation Time: Less than 1 Hour

      May 22, 2018

      Ford Performance Friction Modifier

      Great product but never get over the odor. I have used this product many times.

      2007Vert

      Year: 2013 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Afternoon

      May 14, 2018

      CAME FAST

      CANT WAIT TO INSTALL IT WHEN I PUT MY FRPP DIFF COVER ON.

      BIGRICK

      Year: 2004 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      March 26, 2018

      Great Product

      I bought this for my 93 fox vert because the clutches weren't slipping right on sharp low speed turns. Bought this and went and had it put in along with new gear oil and has drastically helped! The guy said I may need one more bottle due to the upcoming spring/summer heat. I will be buying another and recommend this if you have my same problem and do not wait. Best to catch stuff early before a catastrophe. Thankfully he said my Posi was amazingly tight for how old the car is. Also its a Auto so that is probably why. 2thumbs up

      ChasenS

      Year: 1993 Submodel: GT

      Helpful (6)

    • 5/5

      February 25, 2018

      Necessity for Hot Wether

      Although I wouldn’t recommend additives for anything, I live where Summer Temps reach 120 degrees. I drive my 08 Bullitt and love to “get on it once in while”. I like to help my Diff when I can.

      Bird00

      Year: 2008 Submodel: Bullitt

      Helpful (7)

    • 5/5

      Installation Time: Less than 1 Hour

      February 11, 2018

      No more noises

      After putting this in my rear end it stopped the noises that it would do I recommend it to everyone

      MartinR

      Year: 2002 Submodel: GT

      Helpful (7)

    • 5/5

      Installation Time: Less than 1 Hour

      January 11, 2018

      Must have.

      This is must when changing fluid in your diff. I paired it with royal purple

      Jonsie

      Year: 2013 Submodel: GT

      Helpful (7)

    • 5/5

      Installation Time: Shop Install

      December 24, 2017

      Friction modifier

      Great product, and easy to put in. Feels like the rear end is rolling smoother and there is no noise. Both tires light every time now even when doing clockwise donuts. Good product

      BurtB

      Year: 2008 Submodel: GT

      Helpful (7)

    • 5/5

      Installation Time: Less than 1 Hour

      November 27, 2017

      Easy diff. fluid install

      Friction modifier makes differential noticeably quieter, very easy install and looking for longevity.

      DaleE

      Year: 1998 Submodel: Cobra

      Helpful (7)

    • 5/5

      Installation Time: Less than 1 Hour

      September 19, 2017

      Friction Modifier

      I bought this when I installed my 4:10 gears. I also installed new carbon trac - lock discs at the same time. Ford wants you to soak the carbon discs in this modifier before installing them. They also specify adding 4 oz to the rear diff along w/ the new gear oil. If you zoom in, you'll notice that this bottle only contains 3.8 oz to start with. After soaking the discs, I could only salvage about 2 oz to put in the diff. Not willing to go light, I ended up buying another bottle. If you're upgrading your trac-lock, grab an extra bottle.

      Tripe

      Year: 2004 Submodel: GT

      Helpful (8)

    • 5/5

      September 15, 2017

      2003 Mach 1

      A must when replacing rear-end, always would recommend this product

      DennisW

      Year: 2003 Submodel: Mach 1

      Helpful (7)

    • 5/5

      Installation Time: Less than 1 Hour

      July 26, 2017

      Seems to work

      Replaced an axle and refilled with RP gear oil and this friction modifier. Not sure if the DAM was necessary with the RP but it certainly didn't hurt. Except for the stink. I used a $10 gear oil pump from AutoZone and just poured the FM into one of the RP containers when it was half-empty.

      Coz

      Year: 2014 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Less than 1 Hour

      July 24, 2017

      Another quality part

      Great stuff , quieted my rear end significantly. Had to do my axle bearings so I decided to go with the Ford friction modifier instead of some cheap Auto parts stuff. was not disappointed.

      RandyL

      Year: 1999 Submodel: GT

      Helpful (7)

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