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

Market Price $316.99 You Save 12% ($37.00)

$279.99

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  • Item 100573
  • MPN# 100573

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Features & Details

  • 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
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 ...

Read More
Helpful (1)

5/5
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 ...

Read More
Helpful (1)

Overall Rating 4.7 out of 5 stars
Read All 49 Reviews

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8 Questions / 9 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

    Good Answer (1) (0)

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Will this kit fit a v6 without changing any bearings? Is there any difference between the v6 and v8 axles?

Shava

  • 1st, there is no difference in axles between the late model V6 and V8s. You did not mention the mileage on your Mustang, but it is always an important step to change the bearings. The installer will have to press on the pinion bearing with the appropriate shims and crush sleeve. The installer will then set up the lash with a dial-indicator using different shims. If whomever is installing this kit, must go through those steps, why not install all of the bearings etc for peace of mind? The install price will not differ much either way. Good luck.

    15PSI

    Good Answer (0) (0)

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Wondering if this kit will work with a Torsen differential that I plan to install in my 12?

6Bolt

  • The Ford Performance 3.73 Gears and Install Kit (10-14 V8; 11-14 V6) will be able to work with the Ford Performance Boss 302 Torsen Differential - 31 Spline 8.8 in. (05-14 GT, BOSS, GT500) item #50528 (www.americanmuscle.com/ford-31spline-88-boss302-diff.html). The gear install kit is designed for 8.8" rear gear pinion bearings which works in conjunction with the Torsen Differential.

    KevinD92

    Good Answer (0) (0)

Question Resolved

I am thinking about upgrading to this kit for my 2012 GT. It currently is running on a tune 24/7 because of my boss 302 intake and it is tuned for the stock 3.15 gears. I plan on having this done professionally, I will get a new tune for these 3.73 gears before i take it in. Should i tell the shop not to start the car until i have the new tune for these gears installed?

JJ

  • Naw it will be alright your speedo will be off by a few mph's that's all. If you have a manual car I would go 4.10 only if you don't drive it ever day with that 6 gear you almost can't tell. I got that in my car now and let me tell you it's amazing out of the gate......

    bill2014

    Good Answer (0) (0)

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Customer Reviews (49) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

  • Performance Gain 4.8 4.8
  • Fit 4.644444 4.6



  • 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 Submodel: V6

    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 Submodel: GT

    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 Submodel: V6

    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 Submodel: GT 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 Submodel: GT Moultonborough, NH

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    September 10, 2015

    13 Auto 5.0 is alive!!!!

    I went from 3:15 gears to this 3:73 and all I can say is wow! This gear really helped my automatic get off the line! If I had to do it all over this would have been my first upgrade. The installation kit comes with everything you need except about a half bottle of gear oil. Took me around 3.5 hrs to install. If you have an auto with 3:15s make the switch!

    pound

    Year: 2013 Submodel: GT Mississippi

    Helpful (1) (0)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    November 13, 2014

    Ford Gears with Install kit

    Internal Pinion bearing failed within 2 weeks. Shop that installed the kit showed me the bearing and race. The rollers were not making contact at the center of the rollers. Since I bought and brought the kit I had to pay to have the pinion bearing replaced which is the same cost as the initial install. Shop told me Ford pinion bearings are hit and miss. We installed a timkin but now that the gears have 600 miles on them I am stuck with a slight whine at certain mph's. Only fix is to buy and install new gears and pay for the install a third time. Do yourself a favor and buy a timkin pinion bearing and through the Ford bearing away.

    mtgldr

    Year: 2010 Submodel: GT GA

    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 Submodel: V6 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 Submodel: GT 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 Submodel: GT 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 Submodel: GT 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 Submodel: V6 Hawthorne, NJ

    Helpful (1) (0)

  • 5/5

    Installation Time: Full Day

    April 18, 2014

    the best mod to my mustang yet

    I have a bama tuner, cold air intake and flow master mufflers on 2012 mustang v6 but the car was sluggish off the line or at normal hwy driving after gear install the car has pull at low speed and continues to pull. The car feels like a MUSTANG now.

    doegermbj

    Year: 2012 Submodel: V6 san antonio texas

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    July 08, 2014

    must have

    I have upgraded my stang with exhaust lowering springs and everything you can do to a v6 engine with no supercharger but hands down the 3.73 gears are out of this world!!!!!!!! My stang is pushing 405 horsepower because of the upgrades I did but the gears really woke her up. If you dont have these get them it is such an improvement. Be sure to get a tune it really helps change the shift points it your stang is a automatic. Gas milage did go down some prob lost about a mile per gallon but who cares!!! American muscle is the bomb when it comes to aftermarket parts stop reading this and order the gears you will not be disappointed!!!!!!!!

    dollartree

    Year: 2011 Submodel: V6 murphy nc

    Helpful (0) (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    May 27, 2014

    3.73 are a bit extreme but awesome!

    3.73 are a bit extreme but awesome! I rarely use first gear now unless I am wanting to race someone, otherwise it is really short for stop and go driving. They totally changed the laid back feel of the car to a much more energetic and bold experience. I love them! Rpm is 6th at 70 is around 2400 rpm so fuel economy did drop on the freeway about 2mpg. Install was also pretty expensive with all the shimming involved. Don't forget the install kit!

    MrMiller14

    Year: 2014 Submodel: V6 Roseburg, OR, USA

    Helpful (0) (1)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    May 23, 2014

    Makes a difference

    Got mine installed at a shop for about 400. Price was a little more than I hoped for but it was definitely worth it. You can feel the car pull much harder now and my wide 10 inch tires even chirp when in wot. Gas mileage in the city stood about the same but highway went down about 4 mpg. I would not go any steeper than these gears even though I'm sure for city driving 410 would great.

    joeblo

    Year: 2012 Submodel: V6 tri cities, washington

    Helpful (0) (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    April 10, 2014

    BUY THEM NOW!

    These gears completely changed my 3.7 in the best way possible. I started with 2.73 gears, the cai, tb, and the tunes made things better as far as acceleration and power. Then I went ahead and took the dive for 3.73's, holy h*ll hahahaha awesome. You step on it and you and you fly forward while you're being pushed back! Acceleration and response is dramatically improved, I own an auto so the response is NOW instead of "hold on a second.. now go." As far as mpg.. maybe 2-3 miles loss.. with 2.73 it was 350 a full tank, now its like 340 a full tank (with cai tune included). Get these gears you won't regret it especially if you have an auto, they make daily driving fun.

    Xgeua

    Year: 2012 Submodel: V6 Katy, TX, USA

    Helpful (0) (1)

  • 5/5

    Installation Time: Full Day

    March 21, 2014

    Totally different

    I bought the 3.73 gears for my 2014 Mustang v6. I have a manual 6spd and I weighed the options between this and the 4.10. It was inexpensive for the parts. The labor at the shop was a little more but well worth the cost. Before the car was sluggish and lagged in first and second. Now it moved pretty good and makes me want to buy more mods. I would recommend this to anyone who wants to improve on the performance of their mustang.

    dib14

    Year: 2014 Submodel: V6

    Helpful (0) (1)

  • 4/5

    Installation Time: Full Day

    February 21, 2014

    Install kit was troublesome...

    My installer had great difficulty with the Motive Gear install kit that came with this set. He ended up trashing the kit and using Ford parts, which cost me extra since I basically wasted money on the install kit. Ultimately, the gears don't make a sound. No gear whine whatsoever. Performance wise, they are ok, I suppose. I haven't been able to really get on it yet because they're still in their break in period.

    MatthewL

    Year: 2012 Submodel: V6 Hurlburt Field, FL, USA

    Helpful (0) (1)

  • 1/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    May 29, 2014

    Look before you LEAP

    I ordered the 3.73 gear kit after I had talked with a FORD service adviser. He assumed it would take 3 hours of labor to install the gears. A week later he called me saying in the FORD labor manual it calls for 5 1/2 hours of labor to install these gears ( approx. $ 625 ) I called another FORD dealer and that's what the service manual calls for. Unless your a mechanic, think twice before considering this install. If money is not object, by all means go for it. I couldn't justify spending twice the cost of the part for labor!

    RickD2XNE

    Year: 2014 Submodel: V6 Lincoln, NE, USA

    Helpful (0) (2)

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