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Ford Performance Ring Gear and Pinion Kit - 3.73 Gears (11-14 V6; 86-14 V8, Excluding 13-14 GT500)

Market Price $186.99 You Save 12% ($22.00)
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$164.99

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  • Item 24001

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    Features, Video & Details

    • Strong Forged Construction
    • For Street or Track Use
    • Ford Racing Quality
    • 3.73 Gear Ratio
    • 8.8" Ring Gear Diameter
    • Fits 1986-2014 V8 and 2011-2014 V6 (Excludes 2013-2014 GT500)

    Review & Installation Video

    Review & Install Video

    If you're looking to improve the off-the-line acceleration in performance but without adding any horsepower, stepping up to a numerically higher gear ratio is a great way to do so. Now, the Ford Performance 3.73s that we have here will fit the '86 to '14 V8, the '11 to '14 V6 and '13 to '14 GT 500 equipped with the 8.8 solid rear end. Now, this thing will include your ring and pinion as you can see for right around the $150 price point. And the install will not be for the first time mechanics out there as there is quite a bit of work involved to set up a rear end properly, but we will graze over that here in a bit.&nbsp;<BR style="FONT-SIZE: 12px; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(51,51,51); FONT-STYLE: normal; TEXT-ALIGN: justify; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(248,248,248); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial"><BR style="FONT-SIZE: 12px; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(51,51,51); FONT-STYLE: normal; TEXT-ALIGN: justify; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(248,248,248); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial">So, it's no secret that the factory gear ratio for most of the early cars and I'm talking Fox bodies, SN95s and even some of those early S197s wasn't exactly ideal for scorching off-the-line performance and acceleration. In fact, it was quite the opposite. Now, most of these early cars were working with a 2.73, a 3.08 or in some cases a 3.27 but that was pretty much it until some of those later S197s finally ushered in an optional 3.55.&nbsp;<BR style="FONT-SIZE: 12px; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(51,51,51); FONT-STYLE: normal; TEXT-ALIGN: justify; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(248,248,248); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial"><BR style="FONT-SIZE: 12px; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(51,51,51); FONT-STYLE: normal; TEXT-ALIGN: justify; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(248,248,248); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial">Now, with all that said, again a great way to increase the off-the-line acceleration and performance but without bolting on any go fast parts is to install a numerically higher gear ratio or shorter gear as you'll sometimes hear it described as, which will again help get you up to speed and through those gears a little bit faster. The only drawback here, guys, is a slight hit to your fuel economy but with the days of overdrive transmissions, it's not nearly as bad as it used to be on those old school four-speed cars.&nbsp;<BR style="FONT-SIZE: 12px; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(51,51,51); FONT-STYLE: normal; TEXT-ALIGN: justify; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(248,248,248); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial"><BR style="FONT-SIZE: 12px; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(51,51,51); FONT-STYLE: normal; TEXT-ALIGN: justify; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(248,248,248); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial">But getting to the kit that we have here and again with that fuel economy thing in mind, I would argue a lot of people would probably prefer a 3.73 to a more aggressive 4.10 because depending on your factory gear ratio, you're still getting a much shorter gear with the 3.73, especially if you have like a Fox body with a 2.73 for instance and it's gonna feel totally different but without turning a bunch more RPM on the highway while cruising like you would with a 4.10, so overall, guys, it's gonna be a great compromise.&nbsp;<BR style="FONT-SIZE: 12px; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(51,51,51); FONT-STYLE: normal; TEXT-ALIGN: justify; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(248,248,248); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial"><BR style="FONT-SIZE: 12px; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(51,51,51); FONT-STYLE: normal; TEXT-ALIGN: justify; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(248,248,248); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial">Now as far as the physical gears and construction are concerned, well nothing but the best from Ford Performance as you might imagine, strong forge construction, CNC cut all with lap teeth and then finished off in that black oxide coating. The gears have been made in the USA and Ford Performance claims that these are going to be some of the quietest gears available for that 8.8 solid rear axle. But of course, the biggest cause of noise with a new set of gears will be from either poor installation or poor setup. Listen, guys, installing a new set of gears is a bit of an art form and does involve a decent amount of work along with some specialty tools to get everything dialed in properly. So because of that, we are gonna knock this one up to a full three out of three wrenches on the old difficulty meter. Now, if you don't them set up properly, including your proper backlash, your pattern, your depth all that good stuff could lead to a noisy operation as I just mentioned. So, therefore I will recommend most owners out there who aren't prepared to handle this kind of job, take it to your local shop. It's gonna cost you a few hundred bucks, maybe even close to a thousand depending on your area but you'll thank me at the end of the day.<BR style="FONT-SIZE: 12px; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(51,51,51); FONT-STYLE: normal; TEXT-ALIGN: justify; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(248,248,248); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial"><BR style="FONT-SIZE: 12px; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(51,51,51); FONT-STYLE: normal; TEXT-ALIGN: justify; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(248,248,248); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial">But one thing to keep in mind here, guys, is that after a gear install, especially one with a very drastic change, your speedometer will no doubt be considerably off, so, therefore, you will need to correct it. Now '79 to '98 V8 owners can simply replace the speedo gear and that will be the most cost-effective way to go, '99 and newer owners, on the other hand, can either fix it through a handheld device or tuner or you can look into a speedo recalibration box from Ford Performance for couple of hundred bucks.&nbsp;<BR style="FONT-SIZE: 12px; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(51,51,51); FONT-STYLE: normal; TEXT-ALIGN: justify; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(248,248,248); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial"><BR style="FONT-SIZE: 12px; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(51,51,51); FONT-STYLE: normal; TEXT-ALIGN: justify; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; BACKGROUND-COLOR: rgb(248,248,248); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial">But wrapping things up here, guys. If you're looking to improve your off-the-line acceleration and grunt and work on those VTs a set of 3.73s from Ford Performance would be an excellent choice. And you can grab yours right here at americanmuscle.com.



    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. Ford Racing Ring and Pinion Gears are perfect for street, road, or race use.

    Superior Quality. These Ford Racing 3.73 Mustang ring and pinion gears feature a super strong forged construction, CNC cut & lapped gear teeth, and a black oxide finish to resist corrosion.

    Recommended Upgrade. Changing the rear axle gear ratio will throw off the calibration of your Mustangs speedometer, but a Ford Racing Speedometer Recalibration Tool is an inexpensive way to fix this issue.

    Application. This Ford Racing Ring and Pinion Gear set will fit all 1986 to 2012 V8 Mustangs including GT, Bullitt, Mach 1, Cobra and the 2011-2014 V6 Mustangs equipped with the 8.8" rear end. A master bearing kit is recommended by most installers, especially on high mileage vehicles, see drop down option above.

    Attention 2010 and newer Mustang Owners. Starting in 2010 Ford changed the inner rear gear pinion bearing in all 8.8" equipped Mustangs. Because of this you will require a new 8.8" rear gear pinion bearing (Ford part# 9L3Z-4630-A) for proper installation, please see drop down option above.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.


    Installation & Tech
    Differential Gears - Installation Instructions! Differential Gears - Installation Instructions! Mustang Rear Gears - Tech Article Mustang Rear Gears - Tech Article

    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 2010 2011 2012 2013 2014 Details

    MPN# M-4209-88373N

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    What's in the Box
    Hardware included:
    • Ring
    • Pinion
    • Crush sleeve
    • Pinion nut
    • Shims
    Installation Info
    Tech Specs
    Will it fit my Mustang?
    • Boss 302 - 12, 13
    • Bullitt - 01, 08, 09
    • Cobra - 93, 94, 95, 96, 97, 98, 99, 00, 01, 03, 04
    • Cobra R - 93, 95, 00
    • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
    • GT500 - 07, 08, 09, 10, 11, 12
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 86
    • V6 - 11, 12, 13, 14

    Fits Mustangs equipped with a 8.8" rear end

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    Customer Reviews (95) Write a Review

    Overall Rating 4.9

    out of 5 stars

    Installation Time:Weekend

    Installation Cost:$250-$500

    • Performance Gain 4.833333 4.8
    • Fit 4.904762 4.9



    • 5/5

      Installation Time: Full Day

      March 18, 2019

      Perfect gears for street and drag.

      Ford performance 3.73 gears are perfect for street and drag racing. I installed these on a 2013 mustang 5.0 with twin turbos and they are perfect for low end and high end torque.

      MichaelP

      Year: 2013 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      March 14, 2019

      3.73 gears 2008 mustang gt/cs

      Can definitely feel a difference but if you’re looking for a huge difference go for 4.10 also did a trac loc rebuild

      BillS

      Year: 2008 Submodel: GT

      Helpful (0)

    • 5/5

      February 24, 2019

      Hot Gears

      GT is officially hotter!!! Changes the entire attitude of the stang. Perfect for every day driving and adds a ton of bottom end. Gives the motor more leverage!!! Thanks AM

      DerrellR

      Year: 2002 Submodel: GT

      Helpful (3)

    • 5/5

      January 11, 2019

      Quality parts, great for a DD

      I was getting my axle and pinion bearings replaced, so I decided to switch to a 3.73 from my 3.55 while that was being done. Its not a massive difference from a 3.55, but does provide just a little bit more grunt.

      Hs

      Year: 2006 Submodel: GT

      Helpful (5)

    • 5/5

      December 15, 2018

      WOO-HOO!

      I'm very pleased with the change in acceleration compared to the stock 3.31's. I hate myself for not doing this change years ago. Can't wait to get back to Sebring to try these out. The 1st gear set was mis-matched and couldn't get a good pattern, but AM shipped new ones after my mechanic called.

      rickydog

      Year: 2010 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      December 12, 2018

      great gear kit

      great gear kit for money and fast shipping a m has great deals

      NickT

      Year: 2000 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Full Day

      November 18, 2018

      Great gears

      Much better over the factory 3.31s! I daily drive my car and the 3.73s are perfect, more go when you stand in it and still decent fuel mileage. At 80mph in 5th gear I run about 2400rpms

      WilliamA

      Year: 2008 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      November 09, 2018

      Woke the car up!

      Aside from the Procharger this rear gear change has really woken up the car. I have to learn the shift timing now that it launches much quicker.

      JJ

      Year: 2014 Submodel: V6

      Helpful (5)

    • 4/5

      Installation Time: Full Day

      November 09, 2018

      04 mustang gt 5 spd

      Liked them a lot brought my car alive better gas mileage than 4.10 gear but not as quick but overall love them

      MstthewJ

      Year: 2004 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      October 26, 2018

      Woke my 5.0 LX up with an AOD

      Very happy with the new gear ratio went from 2.73 to 3.73 and now my AOD 5.0 has new life. Yes I lost some highway fuel economy but who cares the fun factor went up lots. I am still in the break in process so I have yet to try and launch the car from a dead stop but I can tell the gears are there doing what I wanted them to do and that is move me from a stop quicker as well as better over all throttle response

      DougS

      Year: 1991 Submodel: LX

      Helpful (4)

    • 5/5

      Installation Time: Weekend

      Installation Cost: $100-$250

      October 17, 2018

      Felt the diffrence

      It was either 4.10 or 3.73. I picked 3.73 and it was a good decision. If you are a daily driver get this don't go higher gears than this. Very hard install if it's your first time give it to the shop saying it from experience lol. Taking the bearing off the housing and the pinion was very hard even with the right tools. Getting the right pattern was also pain and I did it on the lift. But overall got it done it runs good and can feel the difference. If you're going to buy this also buy the carbon clutches, rear control arms (would recomend whiteline), and buy the bearing and shim kit. It took me a whole week to get done. Shop around for shop install and ask for warrenties.

      Sid

      Year: 2012 Submodel: V6

      Helpful (4)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      September 11, 2018

      Better acceleration response

      Had it professionally installed with a one piece aluminum drive shaft. It still has a whirring sound at high speed. Response acceleration is greatly improved. If we can get the whirring noise fixed I will give it 5 stars.

      JeffW

      Year: 2007 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      September 01, 2018

      3.73 Gears

      Great quality, they run quiet, and really woke up the Mustang.

      VaRocker

      Year: 2001 Submodel: Bullitt

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      July 22, 2018

      Seat of the pants.

      Great seat of the pants feel! Wakes up the performance of the car! I would definitely recommend swapping out gears.

      Sally

      Year: 2005 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      June 29, 2018

      Ford 3.73 gears

      Theses gears are great . They gave me the extra boost I needed. Cost 450$ to install and it is worth every penny. Great for acceleration and torque.

      RonaldA

      Year: 2006 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Full Day

      June 25, 2018

      373 gear set

      Complete set comes with every thing you need too rebuild your 8.8 rear end. Installed prefect. Good gear set for manual trans. Rpms are still good. Your Speedo will b off a little. And you may want to get another bottle of royal purple to top off the oil. I would recommend!

      JeremyP

      Year: 2009 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      June 21, 2018

      Getty up and go!

      The 3.73 years are huge step up form the stock 3.31 gears that came with my 09 GT. I got these because the 4.10 gears were backordered and many seem to thing 4.10 is to short of a gear for a 5 speed. I went with the 3.73 on a buddy recommendation that had both. I also got the motive bearing install kit and the GT500 carbon clutch disk pack as well. I had a shop install then and they whined from the get go. I told the shop it was not shimmied properly and they told me to brake it all in because it was all new parts. I knew that this was a un true statement. I put the 500 break in miles on it and took it back to be re shimmied, it took the a additional 2 tries till they got is set perfect. When I changed the fluid after the 500 mile break in I went with a fully synthetic 75-140W and traction additive. The 75-140 is reccomend over 75-90W if the car is going to see a lot of hard launches. At 80mph in 5th gear my tach is reading 2350rmps and I have it calibrated for the gearing with my tuner. 1st great will see almost 40mph when you stomp on it with alot of wheel spin if you dump the clutch. I am Shifting into 5th at120mph now. I will upgrade to 295/40R18 nittos soon from my 255/45R18 Firestones and hope to pick up some more traction thier. This gear is perfect in my opinion, dont hesitate get em now!

      BenjaminA

      Year: 2009 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Full Day

      June 05, 2018

      Excellent gears

      Easy enough to install. Very quit gears with no whining.

      JoshuaH

      Year: 2004 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Afternoon

      May 01, 2018

      Worth the money

      A lot more fun to drive with these. Worth every penny

      Larry

      Year: 2006 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      March 08, 2018

      Love this product

      This product is the best gears out there best bang for your buck

      DeanS

      Year: 1996 Submodel: Cobra

      Helpful (4)

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