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

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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 (100+) Write a Review

          Overall Rating 4.9

          out of 5 stars

          Installation Time:Weekend

          Installation Cost:$250-$500

          • Performance Gain 4.791667 4.8
          • Fit 4.916667 4.9



          • 5/5

            Installation Time: Full Day

            May 06, 2019

            Solid product

            Quality gears, no noise. Installed when doing Trac loc rebuild. Not a huge difference from 3.27, isn't going to turn your car into a rocket by itself. You'll need to add more horse power for that.

            JasonB

            Year: 2004 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            April 19, 2019

            Upgraded from stock 3.31 to 3.73

            Upgrading from the stock 3.31 gears to 3.73 is the equivalent to "gaining" about 12 more torque at the wheels. (3.31/3.73=0.88). This equates to shaving about 0.3 seconds from 0-60. From 4.4 to 4.1s. With that being said, my car noticeably shifts smoother and has more of a spirited feel. There is no more lurching at low end from 1st-2nd-3rd because you're shifting at about 350rpm higher per gear. It also makes downshifting a bit smoother. Because of that, gas mileage loses about 2MPG city/highway on average. I paired this with the Motive Kit as well as the Royal Purple and friction modifier. I have no whine at all driving. Also, be sure to flash your ECU with the new gears so your speedometer is correct.

            lolcantturn

            Year: 2012 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Weekend

            April 16, 2019

            Awesome sauce

            Best thing I have done to this car yet really feel the power now these gears are a must

            Zackattack

            Year: 2000 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            April 15, 2019

            2014 V6

            You sacrifice some gas mileage but definitely a must for the '14 V6. Easier to get into power since you're much closer to the powerband. To be clear you're not really gaining power you're just moving it around.

            ChristianS

            Year: 2014 Submodel: V6

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            April 05, 2019

            Gears are good

            Eazy install set up used same size shims as we're already in the old set up for stock gears and fell into the middle of the specified tolerance.

            BrandonS

            Year: 1998 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            April 02, 2019

            373 Gears in my wife’s car

            I like the gears so much in my 07 GT I bought them for my wife’s automatic.

            HalH

            Year: 2006 Submodel: GT

            Helpful (0)

          • 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)

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