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

56 Reviews
Our Price

$255.99

(kit)
  • Item #100576
  • MPN# 100576

  • Market Price $319.99
  • You Save 20% ($64.00)
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Customer Photos
Features
  • 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
Description
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

Most Helpful Reviews

5/5
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 ...

Read More
Helpful (3)

5/5
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, ...

Read More
Helpful (2)

Read All 56 Reviews
Overall Rating 4.9 out of 5 stars

Customer Photos (7) View All Photos

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5 Questions / 3 Answers

Ask a Question

Rear wheel bearings Will this kit include the wheel/axle bearings or do I have to get them separate ?

robert11111 Year: 2001 Model: Bullitt

  • The rear wheel bearings and seals are usually separate. They come in a set for about $25-30.

    joetrainer31 Year: 1995 Model: GT

    Good Answer (0) (0)

Show 2 more answers Question Resolved

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

Luke Year: 2001 Model: Bullitt

Answer This Question I need this answered (0) (0)

What's the difference between this kit and the one for the 10-14 mustangs? Aren't all GT differentials the same from 05-14?

JeremyJAK Year: 2014 Model: V6

Answer This Question I need this answered (0) (0)

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Customer Reviews (56) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

  • Performance Gain 4.767857 4.8
  • Fit 4.857143 4.9
  • Bang For Your Buck 4.839286 4.8



  • 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 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Anderson, SC, USA

    Helpful (3) (0)

  • 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 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Box Elder, SD, USA

    Helpful (2) (0)

  • 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 Model: Cobra Driving Style: Daily Driver 'Stangs I have owned: 3

    Helpful (2) (0)

  • 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 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 New Jersey

    Helpful (1) (0)

  • 4/5

    Installation Time: Full Day

    April 22, 2014

    3.73 Gear kit

    The kit is great and gives a good performance upgrade. The only small problem was I could not get the crush sleeve to crush and ended up using the old one. I highly recommend this product.

    swilson84

    Year: 2005 Model: Cobra Driving Style: Daily Driver 'Stangs I have owned: 1 North Carolina, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    March 25, 2014

    Feels like Horsepower

    Great product! These gears really wake up a Mustang. As a stand alone mod these gears will make your 'Stang feel like it is making significantly more power. Low end pull is awesome. Highway rpm's are a little higher than with stock gears, resulting in slightly less gas mileage, but well worth the trade. Great "seat of the pants" improvement.

    Marc03GT

    Year: 2003 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 4 Upstate, New York

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    March 21, 2014

    A got to have

    I never thought that adding new gears would make my mustang come alive. The product that I got was overly exeading my expectations. Had a shop install it for best figment and results. The quality of ford racing with all the parts you need to-do the swap, even the oil! I would highly recommend this product to anyone with a mustang. AM did it again

    TwWRIGHT0608

    Year: 1998 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 1

    Helpful (1) (0)

  • 5/5

    January 24, 2014

    Ford racing 3.73 gears are awesome!!!!

    I had purchased my 3.73 gear kit from American muscle for a greate price!! U can't beat that.. When the gears where installed emediatly I felt the diffrance!!! U get to your power way faster than u would with stock 3.31s. And even gas isn't as bad as 4.10s would be and performance is almost the same to me.. I would highly recommend American muscles 3.73 gear kit!!!!

    Edgar31991

    Year: 2008 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Mira Loma, CA, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    December 20, 2013

    3.73 Gear and Install Kit

    I highly recommend this kit for any manual mustang. 3.73 is perfect for my 5-speed. I have an 2003 gt and was easy to install. The kit includes everything you will need. It only took 3 hours to complete. There is no roaring at highway speed. The 3.73 gives you that bottom end you're looking for as well as allowing you to keep your top end. I

    BigRed24

    Year: 2003 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 3 New Bern, NC, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    December 20, 2013

    Best mod ever!!

    My car went from its stock gears to 3.73 and man do I feel the difference. Better acceleration with no loss of Gas mileage. I would recommend this as a first mod. Wakes up the pony :) I also recommend a good reliable shop to the install.

    Fastang97

    Year: 1997 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Denver

    Helpful (1) (0)

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