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Ford Performance 3.73 Gears and Install Kit (10-14 V8; 11-14 V6)

48 Reviews
Our Price

$279.99

  • Item #100573
  • MPN# 100573

  • Market Price $316.99
  • You Save 12% ($37.00)
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Customer Photos
Features
  • Money Saving Combo Kit
  • Ford Racing 3.73 Gears - 8.8"
  • Ford 8.8in Rear Gear Pinion Bearing
  • Motive 8.8" Rear End Installation and Bearing Kit
  • 1 Bottle of Ford Racing Friction Modifier
  • 2 Quarts of Royal Purple Max Gear 75w140 Gear Oil
  • Fits 2005-2014 V8 and 2011-2014 V6 Mustangs 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, inner rear gear pinion bearing, 1 bottle of Friction Modifier, 2 bottles of 75w140 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 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 2005-2014 GT, Bullitt, BOSS, Shelby GT500 and 2011-2014 V6 models.

Application Note: Does not fit 2013 Boss or 2013-2014 Shelby GT500 Mustangs with axle codes S-215-D and S-219-D.

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: 2010 2011 2012 2013 2014 Details

What's in the Box
  • (1) Ring gear
  • (1) Pinion gear
  • (1) Rear Gear Pinion Bearing
  • (1) 3.8 fluid oz bottle of Friction Modifier
  • (2) one quart bottle of Royal Purple Max Gear 75w140 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?
  • GT - 10, 11, 12, 13, 14
  • GT500 - 10, 11, 12, 13, 14
  • V6 - 11, 12, 13, 14
  • Boss 302 - 12, 13

Does not fit 2013 Boss or 2013-2014 Shelby GT500 Mustangs with axle codes S-215-D and S-219-D.

Most Helpful Reviews

5/5
Couldn't be happier

Should have done this mod a while ago. I couldn't be happier with what I got after having these gears installed. My car came equipped with factory 3.31 gears but after driving a 2014 GT owned by a friend ...

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Helpful (1)

5/5
Totally different car!

First let me start off by saying this is an awesome product! Totally trasforms your car. Hooks harder than ever and pulls harder in the 100 and up ranges. Won't regret getting these!

Helpful (1)

Overall Rating 4.8 out of 5 stars
Read All 48 Reviews

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8 Questions / 6 Answers

Ask a Question

Do I have to change my slip differential if I install this?? I want to buy this great combo kit to save money but I was wondering if I get this kit do I need to buy a better slip diff or can I keep the stock mustang v6 2013 slip diff.

JaviGrandlux

  • The stock limited slip diff. Will work just fine, no need to upgrade unless you have over a 100K miles on it or ran it low on lube. Get the gears and bearings installed, then go out and enjoy your stang.

    95PonyGT

    Good Answer (2) (0)

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13 Mustang GT Rear Gear Pinion Bearing Does this kit come with the 8.8 Rear Gear Pinion Bearing? I have a 13 GT and notice on the gears without the kit it says to upgrade the Rear Gear Pinion Bearing. Does this kit come with the upgraded Rear Gear Pinion Bearing for my 13 GT?

MustangGTandHayabusa

  • Buy the install kit grab your wrenches and get started

    spe700

    Good Answer (0) (1)

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Traction-LOK Rebuild Kit Necessary? Do I need this to change the gears from stock 2.73 to 3.73 on a 2013 base model V6? What is the purpose of the rebuild kit?

TheDrew

  • Not necessary to do the swap unless you feel that there is a problem with the current traction-LOK or there are a ton of miles on the car. Being a 2013, I doubt that either of these two situations are relevant

    HATE2W8GT

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Customer Reviews (48) Write a Review

Overall Rating 4.8

out of 5 stars




  • 5/5

    July 22, 2016

    ASTOUNDING PERFORMANCE

    I bought these gears and installed them, and im amazed the amount of acceleration! I did have to get the SCT SF4 Tuner because it made my spedometer 20mph off, (already on my build list) but I tried these against several 5.0's and have been leaving them in the dust. I highly recommend these to anyone serious about improving their mustang. Good job AM

    Durkasdw

    Year: 2014 Model: V6 Driving Style: Race

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    June 16, 2016

    Excited customer

    I purchased the Ford Racing 3.73 gears for my 2012 GT, best upgrade I have done to my car since I bought it.

    Brick1973

    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    May 25, 2016

    Totally different car!

    First let me start off by saying this is an awesome product! Totally trasforms your car. Hooks harder than ever and pulls harder in the 100 and up ranges. Won't regret getting these!

    Hondu

    Year: 2014 Model: V6 Driving Style: Race 'Stangs I have owned: 1

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    October 02, 2015

    Very Nice Gear Set with Everything Required for the Install

    I have a lightly modified 6 speed 2012 Mustang GT. All of the mods are bolt-ons; CAI, Long Tubes, Racing Cats, Higher Output COPs etc. My car was purchased off the lot and had all options except I was stuck with 3.31 economy gears. Although the car gets decent gas mileage on the highway, I bought this car for fun, not economy. After 9 or 10 trips to the dragstrip and some dyno time, it was obvious that I had one more mandatory modification; installing 3.73s. The ratio difference between the two is approximately 12, so mileage wise, it didn't have a significant effect on the highway mileage, but it allowed me to use most of 4th gear at the track. The difference between the 3.31 and the 3.73s is very noticeable. The car is quicker, and the RPM drop between gears is less, making my car much more fun on the street. Not a bad bang for the buck. Definitely recommended.

    15PSI

    Year: 2012 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 1 Leesburg, VA

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    September 13, 2015

    Couldn't be happier

    Should have done this mod a while ago. I couldn't be happier with what I got after having these gears installed. My car came equipped with factory 3.31 gears but after driving a 2014 GT owned by a friend equipped with 3.73 I absolutely had to have the gears changed out. I have driven older mustang (early 2000's) equipped with 4.10 and was undecided on which ratio to go with. Being the car is my daily driver I choose the 3.73's and they feel just right. They are a nice complete to my other mods. I choose to have the install done at a Ford dealer, as I happen to work in sales there, making it very convenient. Also I know the people who are working on my car and receive a discount on the labor. The total install amounted to about $600 prior to my discount.

    DTL77

    Year: 2013 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Moultonborough, NH

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    August 15, 2014

    Feels like the car is pulling the road under it

    Definitely a huge upgrade from 2.73s but my fuel economy sure took a beating. Waiting for some revised tunes to come my way to try and help out in that area. As for the performance, it's a noticeable difference. It feels as if the car is pulling the road, sucking up every last bit of it that it can until I let my foot off. The install was not as easy as I originally thought it would be. I so not recommend tearing into the diff yourself unless you've done it before with great results. This ford rear end is nasty.

    TxMike2013

    Year: 2013 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 4 Tx

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    May 12, 2014

    Good bundle

    Just had these installed so im still breaking them in. As far as the kit itself the only thing it needs is another thing of oil because the two aren't enough. Other than that I'm in sixth gear at 38mph now haha. Must resist urge to floor it. Cost me about $450 to install in california.

    dbowman

    Year: 2011 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 California, USA

    Helpful (3) (0)

  • 5/5

    January 28, 2014

    Quality product

    Still breaking them in... Nice improvement over the stock 3.31's...

    Tdbigt

    Year: 2013 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Denver, CO, USA

    Helpful (2) (0)

  • 5/5

    Installation Time: Afternoon

    September 21, 2015

    Awesome kit

    I have a 2012 GT with an automatic and stock 3.15 gears. After going back and forth between 3.73 and 4.10, I finally decided to go with the 3.73s and this install kit (44k miles on the car). The kit took about 3-4 hours to install, and I haven't had any issues after about a month of driving. Personally I am glad I didn't go with the 4.10s, because my mustang is a daily driver, and the 3.73s are the perfect combination of acceleration and gas mileage (about 1 mpg drop average). The difference is awesome, but to be honest, not as much as I thought it would be, which is fine. Still, getting on the gas from a stop is so much more fun now! Very happy with this purchase. I wish I got these gears sooner...

    AEpack2006

    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 NOVA

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    August 05, 2015

    Automatic that drives like I would a manual

    Made the decision for this install after speaking with my mechanic and AM Customer Support person. While the purchase price was the best on the market for the full kit, the install was significant. I decided to add SR Performance Lower Control Arms since wheel hop is one of the anticipated results of this mod. Total install cost me $600 by transmission shop but, Ford wanted to charge between $850 and $900 just for the gear install so, I guess I can't complain. Anyway, after adding a new BAMA performance tune I am amazed at the results. Ran 120 mile roundtrip errand today and have to say THIS IS THE BEST MOD YET!! First, with the tune, my automatic transmission works like a dream. No lag. No running in 5th gear at 25 MPH. In fact, at highway cruising speed (70 MPH) it remains in 5th gear providing excellent acceleration without having to drive in manual mode. Not sure if this tune will allow it to get to 6th gear, unless driven manually since I didn't go over 70 due to my preference of allowing a comfortable break in. If I had a stick, I'd drive the way it does now. 1st to second gear shift doesn't happen until 1900 to 2000 RPM (as opposed to 1300 to 1400), Shifting is purposeful, obvious and sounds like a manual. At one point I went to manual mode to get to run in 6th. Will only need to do that going forward when my girlfriend is riding with me - LOL. This is a great mod!! Thank you American Muscle for your advice, great product and helping me make the best of my 380HP V6... On it's way to 400HP!! (P.S. A Tune or recalibration tool is a must!!! Without it, your speedo will read 55 when you're doing 40)

    Nicksmoak

    Year: 2013 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 2 Hawthorne, NJ

    Helpful (1) (0)

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