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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

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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?
  • 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
Gears

I love new gears. Really brought car to life!!!!!!!!!!!!!!!!!!!!!!!!!

Helpful (1)

5/5
Noticeable difference

I love everything Mustang and always dream about new things to add to my car for more speed. I don't have a lot of money and probably get to buy something once every other year. Since finances are limited ...

Read More
Helpful (1)

Overall Rating 4.8 out of 5 stars
Read All 100 Reviews

Customer Photos (15) Submit Your Photo

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19 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 (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 this gear kit fit the irs differential for an 03/04 cobra?

Luke

  • Unfortunately no it will not since the 03-04 cobra uses a different style setup. Much like all 2015 mustangs.

    WickedKobra

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 (0)

Does this kit include axle bearings as well? Or would I need to buy those seperately.

AnthonyJ

  • Hi! Unfortunately, Ford Performance 3.73 Gears and Install Kit does not come with the axle bearings. You would need to purchase those separately.

    TerriB

Helpful (0)

Does 3.73 gears make both tire burnout

EarlC

  • 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

Helpful (0)

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Customer Reviews (100) Write a Review

Overall Rating 4.8

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

  • Performance Gain 4.729412 4.7
  • Fit 4.811765 4.8



  • 5/5

    April 21, 2017

    Gears

    I love new gears. Really brought car to life!!!!!!!!!!!!!!!!!!!!!!!!!

    DerekB

    Year: 1989 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    March 06, 2017

    Noticeable difference

    I love everything Mustang and always dream about new things to add to my car for more speed. I don't have a lot of money and probably get to buy something once every other year. Since finances are limited I have to make sure that what I buy is not a waste of time. After lots of research I decided to go for the gears. I am very happy I did, this is the best thing I have put in my car so far. The difference was very noticeable. And for $680 (including installation) I got to say you cannot beat it. You wouldn't believe difference it makes. I am more than happy with my purchase and highly suggest a set of gears. However must say I really would like to know how it feels with the 4:10's. Maybe another time. Thanks American Muscle!

    Butch

    Year: 2006 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Weekend

    February 27, 2017

    What a difference!

    This rear end along with new traction clutches made this car scream! Its a beautiful thing!

    Gerggy

    Year: 1989 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    November 22, 2016

    01 cobra READ

    If you have a 99 cobra you have irs instead of a straight axel so the shop will give it to you good because it is double the headache to install. had these installed on my 01 cobra and I mean you will not be disappointed. Everyone says don't fear the gear and go 4.10's but i prefer 3.73's especially when trying to keep up on the way to cars and coffee I don't want to be running 3 grand. This gave me exactly what I was looking for, best upgrade yet.

    SvtAustin

    Year: 2001 Submodel: Cobra

    Helpful (1)

  • 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: Afternoon

    May 23, 2016

    Excellent product, and super fast shipping.

    I received this gear in 3 days, had it put in, and it's like I'm driving a completely different car. I couldn't be happier with this product.

    J

    Year: 1989 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)

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