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Ford Performance 3.73 Gears and Install Kit (86-09 V8)

Market Price $319.99 You Save 16% ($50.00)
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$269.99 (kit)

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  • Item 100576
  • MPN# 100576

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    Features & Details

    • Money Saving Combo Kit
    • Ford Racing 3.73 Gears - 8.8"
    • Motive 8.8" Rear End Installation and Bearing Kit
    • 1 Bottle of Ford Racing Friction Modifier
    • 2 Quarts of Royal Purple Max Gear 75w90 Gear Oil
    • Fits 1986-2009 V8 with 8.8" Solid Rear Axle
    Improve ET's and low end torque. Are you looking to get more low end grunt off the line and lower ET's at the same time? Then look no further than installing a set of steeper gears in your Pony. This Ford Racing Ring and Pinion Gears are perfect for street, road, or race use.

    Complete Kit. This Ford Racing Gear and Installation Kit comes complete with all the components needed to swap out your ring and pinion gear. It includes Ring gear, Pinion gear, 1 bottle of Friction Modifier, 2 bottles of 75w90 Gear Oil, gaskets, seals, shims, bearings and all the required hardware.

    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.

    Recommended Upgrade. Changing the rear axle gear ratio will throw off the calibration of your Mustangs speedometer, but a Speedometer Gear, a Ford Racing Speedometer Recalibration Tool or a Bama SF4/X4 Power Flash Tuner is a quick and easy way to fix this issue.

    Application. This Ford Racing 3.73 Rear Gear and Installation Kit is designed for use with 8.8in solid rear axle equipped Mustangs, including the 1986-2009 GT, Bullitt, Mach 1, Shelby GT500 and 1994-1998 SVT Cobra. It will not fit the 1999-2004 IRS equipped Cobra Mustangs.

    Technical Note. Installation costs will vary, but a good rule of thumb is between $250 and $300. Be sure to work with a reliable shop that you trust for installations. You can also save money on your installation labor by having your Trac-Lok rebuilt at the same time as your gears are installed, see drop down option above.

    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 Details

    What's in the Box
    • (1) Ring gear
    • (1) Pinion gear
    • (1) 3.8 fluid oz bottle of Friction Modifier
    • (2) one quart bottle of Royal Purple Max Gear 75w90 Gear Oil
    • Front & Rear Pinion Bearing
    • Pinion Seal
    • Carrier Bearings
    • Carrier Shims
    • Differential Bearings
    • Crush Sleeve
    • Pinion Nut
    • Cover Gasket
    • Ring Gear Bolts
    • Brush
    • Gear Marking Compound
    • Loctite
    Installation Info
    Will it fit my Mustang?
    • Bullitt - 01, 08, 09
    • Cobra - 93, 94, 95, 96, 97, 98
    • Cobra R - 93, 95
    • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09
    • GT500 - 07, 08, 09
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 86

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    26 Questions / 6 Answers

    Ask a Question

    What gears come stock on 2008 GT?

    Anonymous

    • For 2008 GT's with manual transmissions will have a 3.55 whereas the stock GT's with an automatic in a 2008 Mustang will be 3.31.

      KevinD92

    Helpful (3)

    If i get this kit for my 97 gt automatic what Speedo gear do i need to fix my speedometer?

    Anonymous

    • The Ford Performance 3.73 Gears and Install Kit will require a new speedometer gear, however, depending on the tooth count on the drive gear, the appropriate gear may vary. If your Mustang has a 6 tooth drive gear, you will need item #383922. If your Mustang has a 7 tooth drive gear, you will need item #53685. If you Mustang has a transmission with an 8 tooth drive gear, you would technically need a 25 tooth gear, however, that was not an available option, and would would need to be made for your application.

      AMJEFF

    Helpful (3)

    I've seen others ask about the rear wheel/axle bearings do they need to be changed out when buying this kit or does it not matter

    MikeR

    • The rear axle bearings would not need to be changed out when doing this kit however it would not be a bad thing to change them out so everything is new!

      Ricky36

    Helpful (1)

    Hi, My 08 Roush Stage 3 comes with 3.55 gears and was curious to know what changes in performance driving I could expect by switching to the 3.73 gears? Thanks!

    MarkB

    • Hey Mark, So technically it doesnt have a change in power but it changes in how fast the power reaches you. Or allows you to go faster, faster. It takes power from the bottom end and moves it to the top end meaning your car will have a lower top speed but you'll feel a difference in acceleration of the car.

      Cobra_Machine04

    Helpful (1)

    Do you have a similar product for 3.9l v6?

    Texvape44

    • We do not have a gear and install kit for the 3.9L V6 motor.

      KevinD92

    Helpful (1)

    Will these help my 03 gt convertible. Looking for speed but wanting to keep the car stock ish if you know what I mean.

    Anonymous

    • Larger gears will definitely aid the car in taking off faster. Though, to gain performance you can also add a cold air intake and a better flowing exhaust.

      AshleyK

    Helpful (1)

    People Who Bought This Item Also Bought

    Customer Reviews (100+) Write a Review

    Overall Rating 4.7

    out of 5 stars

    Installation Time:Weekend

    Installation Cost:$250-$500

    • Performance Gain 4.651786 4.7
    • Fit 4.767857 4.8



    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      May 06, 2018

      Love these gears

      The kit comes with everything you need my mechanic had no problem installing them

      AlfredoZ

      Year: 2000 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      April 30, 2018

      Great

      Fast and easy install,great valve for your money really feel the difference

      EdwardoA

      Year: 1984 Submodel: Other

      Helpful (1)

    • 5/5

      Installation Time: Full Day

      April 26, 2018

      Awesome package!

      Made for a great first time DIY installer like myself. The kit is nice because it comes with 2 crush sleeves and 2 pinion nuts in total which came in handy after I over torqued the crush sleeve my first attempt. Gears improved performance as well as no sound coming from rear end. Happy customer!!

      DrewE

      Year: 1999 Submodel: GT

      Helpful (1)

    • 5/5

      April 25, 2018

      Great product

      Everything you need to install the ring and pinion. No guess work involved.

      jasonm

      Year: 1993 Submodel: Cobra

      Helpful (2)

    • 5/5

      April 24, 2018

      Everything You Need

      Item arrived with all the pieces as shown. Was my first time regearing a car on my own (have replaced rear ends never regeared). The pieces all fit together very well and have been in the car for a year now and zero issues. Highly suggest having experienced help though as it took me awhile due to lack of tools to properly complete the job.

      LeviA

      Year: 1995 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Full Day

      April 19, 2018

      All you need for the gear swap

      Just got this gear installed yesterday. The kid had everything I needed. Will take time to break in the gears. But so far so good.

      DmitryS

      Year: 1997 Submodel: Cobra

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      March 09, 2018

      Can’t grab that $100 bill

      Man what a difference throw you back in the seat. Place a a $100 bill on the dash when I hit second gear I bet you can’t grab it. If you do it yours!!!

      LonnieT

      Year: 1993 Submodel: Cobra

      Helpful (3)

    • 5/5

      Installation Time: Full Day

      March 06, 2018

      3.73 gears!!

      My 07 auto has some engine upgrades but the 3.31s in the rear were not keeping up with the power. After these were installed the car just simply came together for an ultimate daily driver. No whining issues(so far). Off the line or stand still car just wants to take off. If you are on the fence with 4.10s and 3.73s go 3.73 first but I think the 4.10s for daily driving would be a little much. After the 93p tune came in speedo was fixed and CANT wait to try the race tune soon!!

      Dmadlock123

      Year: 2007 Submodel: GT

      Helpful (3)

    • 4/5

      Installation Time: Shop Install

      February 26, 2018

      Good set

      Great bang for your buck well Worth the price was packaged well also got here within two days

      WillyC

      Year: 2000 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      February 01, 2018

      Gears for everyone

      Good gear ratio for a daily driver. Also didn’t affect the gas mileage much. I should of done this a long time ago. Would recommend this for everyone

      KevinA

      Year: 1996 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      January 20, 2018

      3:73 gears

      should of went with lower gears maybe 4:11 but they worked fine

      Bob

      Year: 2006 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Afternoon

      January 06, 2018

      Gears

      Great product great price easy install. Recommend everyone to use American Muscle.

      korys

      Year: 1990 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      November 27, 2017

      373 gear

      Excellent product, fast shipping, awesome customer service...

      Allen

      Year: 2003 Submodel: GT

      Helpful (2)

    • 1/5

      Installation Time: Shop Install

      Installation Cost: $1000+

      November 20, 2017

      No stars!!!!

      Tried to get one over on me! Send me used gears!!!! Car still apart waiting for A.M. to make it right! Very unsatisfied!! Go figure they wont let me give no star!!

      GregL

      Year: 1992 Submodel: LX

      Helpful (8)

    • 3/5

      Installation Time: Full Day

      November 05, 2017

      Gears great/ Kit not

      I love the gears, and the added umph coming off the line. However, the gear marking compound was dried out, so my mechanic set everything as best he could. Also, the gasket for the diff cover has developed a leak, and he regrets not using RVT.

      ChrisY

      Year: 2005 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      October 17, 2017

      great upgrade

      very good up grade to your mustang wakes it up nice with the other mods have done

      Ericc

      Year: 2006 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      September 01, 2017

      Up the gears

      I trust American muscle so I purchased my new 373 gear kit from them. I took my cobra to Lamatta performance in Cassleberry fl. to have the gears installed and he knew exactly what they were sending. He used most of the parts sent, but he prefers using a different and he says better quality of rings. He says he uses his rings on all his gear upgrades. Lamatta's has ALWAYS done quality work on my cobra, and his reputation is undisputed.

      DavidF

      Year: 1997 Submodel: Cobra

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      August 20, 2017

      Good priduct

      Definetly worth the money feel the difference all around I also bought the carbon track lock kit as well .. I recommend a lift because you have so l8ttle room on jacks ..

      Dubs

      Year: 2006 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      August 01, 2017

      I wish i would have done it sooner

      These are pretty swèet and definitely and good upgrade but good luck trying to fix the speedometer.

      Shorty17

      Year: 1997 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Full Day

      July 30, 2017

      Woke up

      Totally woke up the responsiveness of the throttle makes the car totally come alive. Try to plan a whole day for install, doesn't take the full day just make sure you do it right

      Louie

      Year: 2003 Submodel: GT

      Helpful (2)

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