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

Market Price $319.99 You Save 20% ($64.00)
Our Price

$255.99 (kit)

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  • Item 100576
  • MPN# 100576

In Stock Ships same business day. Choose options to add to cart

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?
  • Foxbody - 86, 87, 88, 89, 90, 91, 92, 93
  • Cobra - 93, 94, 95, 96, 97, 98
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09
  • Bullitt - 01, 08, 09
  • Mach 1 - 03, 04
  • GT500 - 07, 08, 09

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
Not bad

This is a nice upgrade for little more power! Not to hard to put in at all!! Took a good 7-8hrs to put it in, so worth the time and money!

Helpful (1)

5/5
3.73 gear install

Well worth the money. Went from a 3.31 to a 3.73. Had a local speed shop install. All around pull is much better. Not realy much of a mileage loss. 80 mph is about 2600 rpm. Much more responsive. Would ...

Read More
Helpful (1)

Overall Rating 4.8 out of 5 stars
Read All 90 Reviews

Customer Photos (13) Submit Your Photo

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17 Questions / 6 Answers

Ask a Question

What gears come stock on 2008 GT?

Anonymous

Helpful (1)
  • 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

Does 3.73 gears make both tire burnout

EarlC

Helpful (0)
  • If you are looking to do a burnout, gears would not be the item you need to use to do that. While I do not recommend doing burnouts on the street and only would do them when drag racing, what you will need is a tire line lock kit.

    KevinD92

Do you have a similar product for 3.9l v6?

Texvape44

Helpful (0)
  • We do not have a gear and install kit for the 3.9L V6 motor.

    KevinD92

Wanting to get the 3.73 gear and kit on my 07 gt. Can I just throw the gears in or do I need to buy something else. Also I have the bama x4 programmer. will the fix the speedo problem or do I need to buy the gear for that too?

Lilmike12993

Helpful (0)
  • The Ford Performance 3.73 Gears and Install Kit should come with everything you need to install your rear gears. The BAMA tuner can correct the speedometer for gear changes as long as it is an electric speedometer.

    pserafi

Does this fit 07 GT500?

Chris

Helpful (0)
  • This will be able to fit the 2007 GT500.

    KevinD92

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

Anonymous

Helpful (0)
  • 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

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Customer Reviews (90) Write a Review

Overall Rating 4.8

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

  • Performance Gain 4.76 4.8
  • Fit 4.853333 4.9



  • 5/5

    August 04, 2016

    Great kit!

    I had my local Ford service department install it and they were impressed that it included everything needed for a clean installation. The new gears are much quieter than the ones they replaced. Thanks AmericanMuscle! Arizona

    BottleRocket

    Year: 2007 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Weekend

    June 18, 2016

    great, cheap upgrade!

    great little kit, only thing id suggest is getting some axle bearings and seals and replacing those while youre in there, i did a trac lok rebuild as well. dont be like me and forget to shim the pinion then have to pull the bearing off and reshim! overall id suggest buying it.

    grizzdip96

    Year: 2004 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    May 13, 2016

    Love

    Love this set of gears, personally like the oil it comes with. Fast shipping! Thank you Am!

    Brando

    Year: 2001 Submodel: GT

    Helpful (1)

  • 4/5

    Installation Time: Full Day

    March 03, 2016

    great

    It gave my pony just what it needed to unlock it's hidden power!

    StringBean

    Year: 2002 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    March 02, 2016

    Good Price Good Product

    Works real good and I think a Good price for Ford Racing Productions comes with everything you need!

    Banshee006

    Year: 1996 Submodel: Cobra

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    November 16, 2015

    Aadded 3.73 gear

    This gear was chosen due to the reviews of others , and past experience. I have had mustangs with 4.10 and you don't give up much using a 3.73 but you have a little friendlier drive in 5th gear. Gearing on a stock GT In this year is usually a 2.73 , you can check code on door if it is listed as M under axle that is what you have, this change a lone with make a huge gain in acceleration. You will need to order a 21 tooth white speedometer gear to correct speedometer.

    mustang96

    Year: 1996 Submodel: GT va beach va

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    October 30, 2015

    3.73 gear install

    Well worth the money. Went from a 3.31 to a 3.73. Had a local speed shop install. All around pull is much better. Not realy much of a mileage loss. 80 mph is about 2600 rpm. Much more responsive. Would definately recommend this. It's a must if you only have 3.31's.

    Jsmyer

    Year: 2008 Submodel: GT Lewisburg ohio

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    September 28, 2015

    Not bad

    This is a nice upgrade for little more power! Not to hard to put in at all!! Took a good 7-8hrs to put it in, so worth the time and money!

    mercerjays

    Year: 2004 Submodel: GT Topeka

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    September 29, 2014

    Added some great get-up and go!

    Recently added these gears to my mustang and it for sure get the mustang off the line a lot quicker. My fuel mileage on the highway has not dropped off to bad as well!

    ForrestS

    Year: 2002 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Weekend

    April 22, 2014

    ford racing 3.73 gears are a MUST!!!

    These gears will wake up your pony and you will notice the difference From the STOCK!!! HURRY and put one in your cart today!!

    Sinistergt94

    Year: 2002 Submodel: GT Cotulla, TX 78014, USA

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    April 22, 2014

    Excellent Products

    I got my gears from Americanmuscle.com and had them installed at a shop and the cars feels amazing and faster, you can feel the difference on the car already. I got everything I needed in this kit. I'm really happy with the product.

    Davino50

    Year: 1994 Submodel: GT Paramount, CA, USA

    Helpful (1)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    March 22, 2014

    Good gains

    The product was great priced and a good upgrade, can definitely feel the gains. I would recommend this to anyone. The only negative was how much the shop charged for install. I had to pay $550 which I feel is a little high.

    Rick24

    Year: 1988 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    March 21, 2014

    Great quality product

    This kit is really good pulls hard and is quiet. Had shop install and no gear whine. Comes with everything you need

    gils99gt

    Year: 1999 Submodel: GT Suffolk, VA, USA

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    March 21, 2014

    3.73 gears and install kit

    Best upgrade so far came with everything needed. Dropped the car off at the shop to get the gears installed picked it up the next day and WOW!! Totally different car it seems like first, second, third, fourth, fifth all in the perfect RPMS to have a ton of fun! And as always American muscle has the right parts to make your stang come alive!

    Bens197

    Year: 2008 Submodel: GT Winder, GA, USA

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    March 21, 2014

    Nice improvement

    The improvement off the line is very nice. I took it to a local shop so I can't say much about the install. But I can say when I got it back I loved the overall power out of the hole I got.

    tmoez

    Year: 2005 Submodel: GT Charlotte, NC, USA

    Helpful (1)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    February 21, 2014

    Good product

    Love the way it woke my car up from the factory gear. The only complaint I have is that the shims dont fit 100%. Other then that...great product!

    mystang02

    Year: 2002 Submodel: GT NC

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    June 02, 2014

    Great acceleration

    I can definitely feel the acceleration when I step on the gas pedal. I had my local shop install the gears for about 270 not to shabby. The only thing is now my speed odometer is off which I need to adjust but overall I recommend this product

    mikes99gt

    Year: 1999 Submodel: GT Anderson, SC, USA

    Helpful (3)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    April 29, 2014

    Gitty up and go

    The 3.73 gears really gives the Mustang the go that it needed off the line or from a stand still. I could tell the difference that the 3.55 factory gears did for my sons car and wanted more. The 3.73 gears are very street friendly with the overdrive only running 2100-2200 rpm at 65 mph. The wife even could tell how it put her back in the seat more. I did not want the engine to scream because I have Corsa after axle exhaust and a convertible so running quite when needed was important. Great choice without going too far.

    DakotaStang

    Year: 2007 Submodel: GT Box Elder, SD, USA

    Helpful (2)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    March 25, 2014

    1998 Cobra

    Gears are a must for any mustang of any year. The stock 98 Cobra gears are 3.27's. You'll hear the debates of 4.10's minimum for the B-Headed 96-98 Cobras, but I disagree. The 3.73's provide a great acceleration, yet first gear is still usable and highway cruising won't get you past 2600rpms (and thats cruising at 80mph). This kit is a great bang for the buck, although I did use different gear oil than the Royal Purple provided because i've heard Royal Purple has gone down hill in the recent years. I also added axle bearings in my order. Couldn't be happier with the purchase.

    gkomo

    Year: 1998 Submodel: Cobra

    Helpful (2)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    October 12, 2015

    Makes the stang way more fun to drive!

    Installed on a 03 mustang gt. Already had a tuner so adjusting the speedometer wasn't a problem. Still in the break in period but so far its a nice upgrade to the gearing of the car. No more underpowered sluggish feeling in 5th gear cruising. Can really feel the quickness off the line and through the gears. The tires can be broken loose with ease. The mechanic had mentioned that the rear needed 3 bottles of gear oil. Not sure why there are only 2 bottles included in the kit but thats no big deal. Overall If I ever own another mustang this will be the first mod to be done before any intake or engine work.

    J

    Year: 2003 Submodel: GT New Jersey

    Helpful (1)

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