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Ford Performance Ring Gear and Pinion Kit - 3.73 Gears (05-09 GT)

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  • Item 24001G05

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    Features, Video & Details

    • Ford Racing Quality
    • Strong Forged Construction
    • 3.73 Gear Ratio
    • 8.8" Ring Gear Diameter
    • For Street or Track Use
    • Fits 2005-2009 GT, Bullitt and GT500 Mustangs

    Review & Installation Video

    Review & Install Video

    Hey, guys, Stephanie with AmericanMuscle.com here with these Ford Racing 3.73 gears for all Mustangs with an 8.8 rear or '86-'14 V8 and 2011-2014 V6 Mustangs. Gearing's really important to a car, and it can make or break a build no matter how much power you may or may not have. Gears should be carefully chosen based off your intentions and the performance that you want out of your car. These 3.73 gears from Ford Racing are gonna be a good option for those of you out there that aren't wanting to spend a ton of money, but that are looking for a good gear that will perform well for a daily driver and for the car that might see the track occasionally. I would say that the 3.73 gear is a middle of the road option. It's short enough to provide a huge difference in driveability, but not so short that it'll create a negative impact on street driving. When you go about choosing your rear gear, you'll have to keep in mind where and how you mostly drive your car. You do a lot of highway driving, you aren't going to want a short gear, and if you're looking for acceleration improvements from a stop, you aren't going to want a tall gear, either. A 3.73 gives you a little bit of both worlds here. You'll get a cruise on the highway without screaming in those higher RPMs, but you're really going to notice a big change in acceleration as well and that's what makes these good for a daily driver. If you're coming off of stock gearing and you're moving into a 3.73, you're going to think that you're driving a totally different car because the gears are gonna totally change the driving experience. Even if you have some bolt-on mods already, your car probably still feels sluggish but it won't after the gears are installed. If we break this down some, the basic way that rear gears work can be boiled down to saying that the number of the gear is how many times the drive shaft will turn to one turn of the rear wheels. So in this case, the drive shaft will turn 3.73 times for every one turn of the rear wheels, and this is how such drastic changes in the driving experience are made. Typically speaking, low gears give higher top speeds and better fuel economy, but the tradeoff there is a car that's slower off the line with less torque. High gears, on the other hand, are the exact opposite and the 3.73s hear fall in the middle, and they're a great all-purpose type of gear. A set of gears includes a ring and pinion gear and Ford Racing gears a forged gear that are CNC cut with lapped gear teeth. These also have a black oxide finish, so that'll help resist corrosion, and in case you happen to be worried about it, these are not a noisy gear so don't expect a lot of whine with these. Upgrading rear gears will throw off the calibration of your speedo no matter which brand you end up choosing. It's just a side effect of choosing the ratio, but Ford Racing does make a recalibration tool to fix this issue, so just keep that in the back of your mind. Or the issue can be fixed with a tuner, as well, but if you don't happen to already have a tuning device, then the recalibration tool is going to be a less expensive way to fix it. As far as price, these gears are going to be the least expensive that are available on the site, costing under $150. There are some other brands to choose from but they're gonna be more expensive, and I did want to mention that you should also pick up a gear install kit while you're purchasing these. The price of this kit is going to change depending on if you want just the install kit or an install and bearing kit, but you're looking at an additional 30-75 bucks for either one of these. And depending on the mileage and the last service, it could also be a really good idea to invest in entirely rebuilding the rear while it's apart, but that's up to you. So I'm not gonna say that the install here is easy because it's not. You're looking at taking the car to a shop for a proper install or having a nice collection of tools since you will need a handful of items and about four hours to get the job done yourself. This is a three out of three wrenches on the difficulty meter. This is a pretty big project that's going to require removing the axles, which means dropping the driveshaft, the rear brakes, the diff pinion shaft, and the axle shaft U-washer, and you've got to remove the differential itself, which means removing the diff bearing cap bolts and the shims, which all needs to be marked and reinstalled the same way. The assembly and install of the new gears is very specific, and I'm obviously giving you guys a general overview here, so I'll just mention that you'll need to check for diff case run out as well as check pinion depth and do some shimming, as well. Then you've got to get it all back together after measuring and checking your work over. Wrapping things up here, the Ford Racing 3.73 Gears for the 8.8 rears are a great gear for cars that see a lot of street time and some track time. They're a middle of the road gear that offers the best of both worlds when we look at the benefits of a tall gear versus short gear, and they're the most affordable gear set on the site. They are CNC cut and they have lapped teeth, and you can check them out more online 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 2005 to 2010 V8 Mustangs including the GT, Bullitt and GT500 models. 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.

    Fitment: 2005 2006 2007 2008 2009 Details

    MPN# M-4209-88373

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

    What's in the Box
    • (1) Ring gear
    • (1) Pinion gear
    Installation Info
    Tech Specs

    Approximate RPM for 2005-2010 GT


    Manual
    Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
    1 3888 5443 6998      
    2 2301 3221 4141 5061 5981 6902
    3 1518 2126 2733 3340 3948 4555
    4 1150 1610 2070 2531 2991 3451
    5 782 1095 1408 1721 2034 2347


    Automatic
    Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
    1 3704 5185 6667      
    2 2634 3688 4741 5795 6849  
    3 1771 2480 3189 3897 4606 5314
    4 1150 1610 2070 2531 2991 3451
    5 817 1143 1470 1797 2123 2450
    Will it fit my Mustang?

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        Questions & Answers (13)

        5 Top Rated Questions

        I have an 07 GT with some bolt on's, Roush CAI tuned to 93 octane. I have 3.31 gears and looking at going 3.73. Just looking for a bit more off the line if ever needed :) but didn't want to kill top end or gas mileage. Thought that would be a middle of the road option. I see that there is a recalibration needed to correct the speedometer. I am using the Diablo tuner. I know when I program the car it asks for the gear. If I retune it and select the same but enter the 3.73 gears, would that calibrate it? Didn't want to buy the calibration tool if I didn't need to. Thanks for any input.

        • When installing your Ford Performance Ring Gear and Pinion Kit, selecting the gearing as 3.73 will correct the speedometer in your 2007 Mustang GT.

        Helpful (3)

        if i have my local ford dealer install these can they calibrate my speedometer?

        • I would suggest calling your local Ford dealer to check and see if they will install the Ford Performance 3.73 Gears and if they can calibrate your speedometer as well although I do not believe they can recalibrate the stock tune for larger gears. I suggest using the Ford Performance Speedometer Recalibration Tool ( which can be found here: https://www.americanmuscle.com/ford-speedo-tool-9410.html ) to properly recalibrate your speedometer after you get the 3.73 gears installed.

        Helpful (1)

        Hello AM. You posted my question but didon't answer it. I have an 07 GT automatic. I belive it has 322s in it. I drive on the hi way alot and I'm concerned about the Rpms how will they be with the 373s? Or the 410s. Thankyou and you guys are great

        • With 3.73's at 75 mph you should see approximately 2450 RPM, and at 65 around 2100 RPM. With 4.10's you will see approximately 2700 RPM at 75 mph and around 2300 RPM at 65 mph.

        Helpful (0)

        I have a 2007 Mustang GT completely stock and this will be the first mod I will be applying to it. I know I will need a bearing kit. What else may I need to install this part and is there anything else that I will need to upgrade or purchase along with the new gears?

        • We would suggest purchasing the items under the "Buy Together " tab. Those are all parts you are going to want to replace. Especially on Mustangs older than 4-5 years.  

        Helpful (0)

        I have 3.55 in my 07 GT, but the rear end has went out for the second time in about a months time. The first time we replaced the pinion bearing and reoiled and it worked but with a whine. It blew again on the highway :/. My question is, if I get these will they have to be shimmed or anything or would I be good to just tear down and swap?

        • The Ford Performance Ring Gear and Pinion Kit and all other gears we offer will require proper shimming in order to achieve the correct gear mesh pattern.

        Helpful (0)
        Post Your Question
        8 More Questions
        If I have a Baja hand held tuner, will they be able to send me the correct tune to fix my speedometer? 1 answer
        So I've heard both ways. You get gears, you NEED a tune. You get gears, tune isn't necessary. I would like to buy these gears and get them installed. But do I really NEED to tune it afterwards? And if I don't, what are the consequences? Please if y'all could help me out. 1 answer
        Is a tuner necessary to correct the Speedo after gears or can a dyno shop correct the speedo without a tuner? 1 answer
        Hello guys, I recently had this set of gears installed and I've completed my break in period so now its time for the gear oil change. I am wondering it if would be best to go with 75w140 oil which is what the stock gears used on the 08 Stang. I know the gears come with 75w90 but ford had a TSB where they changed all there oil to 75w140 due to complaints of rear end noises. 1 answer
        i want to go without a tune or recalibration tool would that work out or would it effect my engine ? and can i go only for the gears and get the other parts later ? 1 answer
        What gains will I notice in my 07gt500? I know the KR and super snake came with a 3.73. What will I notice changing from a 3.31? I have an 07 gt500. I realize it came with a stock 3.31. I know the gt500KR and the Super Snake came out with 3.73. What awe the advantages of the change? 5 answers
        Will a Gear upgrade need a tune? Thinking about giving my automatic 06GT a gear upgrade. Will this require a re-tune of any sort? Bama, Diablo, etc.. Thanks! 4 answers
        how noticeable are 3.73 I have a 2007 GT and I know that the stock gear ratio is 3.55. My question is how noticeable would a change to 3.73s be because it doesn't seem like the significant of a change 4 answers

          Customer Reviews (79) Write a Review

          Overall Rating 4.8

          out of 5 stars

          Installation Time:Weekend

          Installation Cost:$250-$500

          • Performance Gain 4.756098 4.8
          • Fit 4.853659 4.9



          • 5/5

            Installation Time: Afternoon

            June 03, 2019

            Great gear set.

            Good quality gear set that you would expect from and OEM supplier. Gear matched up perfect with crush sleeve that came with the set, torqued in perfectly .

            DonL

            Year: 2005 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            April 02, 2019

            373 Gears

            I had these gears installed at a shop for 250 dollars I already had hot rod cams and JLT 3 and X pipe with flow master 40s in my 5 speed it will bark in 3rd spin side ways in 2nd Over 300 hp at tire Dyno going to put BBK long tube headers next but the gears helped it Launch

            HalH

            Year: 2006 Submodel: GT

            Helpful (1)

          • 5/5

            Installation Time: Afternoon

            March 10, 2019

            Ford 3.73 Gears

            These 3.73 gears really woke up the mustang. Quality built gears. Highly suggest getting a tune afterwards. Very satisfied with my purchase!

            Jerad

            Year: 2007 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Afternoon

            January 23, 2019

            3.73 Ring and pinion

            Stupid quick Acceleration over the factory 3.31, Installed on an automatic Still Streetable @ 1700 Rmp in 5th gear lock up on the highway. best for around town driving and some highway, doesn't pull as hard when downshifting on hwy to pass.

            Dave02

            Year: 2008 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            January 15, 2019

            Worked absolutely fantastically.

            Everything lined up nicely as expected being a ford performance part. and has a little more snap than the stock 3.55's but still get decentish gallons per mile.

            SimonR

            Year: 2006 Submodel: GT

            Helpful (1)

          • 4/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            September 03, 2018

            Great gears

            3.73 gears are a huge improvement over the stock 3.31s. Ford raceing gears need to be toured down to 100 vice 85 pounds on stock gears. Also put in the carbine fiber clutch pack and sytehnenic oil. Cruise 75-85 on the freeway at 2500-2750 rpms in 5th gear. Can grab 3rd gear at 80mph and pulls pretty hard up to 145mph. 1st gear pulls hard to 35mph and chirps 2nd on 255/50r18 Firestones. Wanted to get the 4.10s but they were on backorder. All in all I am satisfied with en but wonder how the 4.10s would be. Probably upgrade to 4.10s next summer on 295/45r18 nitto555 g2s.

            BenjaminA

            Year: 2009 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Afternoon

            August 27, 2018

            Nice extra Bite

            Had 3.55s but these added extra grab going into higher gears! With carbon discs

            BrandonGTboy

            Year: 2011 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Shop Install

            July 23, 2018

            Ford Performance Gears 3.73

            A big change in the performance of my Mustang. I am very pleased with the results. Only about 200 RPM's more at highway speeds.

            JohnP

            Year: 2007 Submodel: GT

            Helpful (7)

          • 3/5

            Installation Time: Full Day

            June 30, 2018

            feel the different

            increases acceleration needs addtional service parts for 8.8 rear axle

            Arthur

            Year: 2005 Submodel: GT

            Helpful (5)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            March 16, 2018

            3.31 to 3.73 upgrade

            I had the new gear installed professionally. I have 500 miles for break in. I had to adjust the computer it was 3 mph off. I used my tuner. I have noticed running 60 mph I am running about 2 grand versus the normal 1800. So far what little I have drove it, no major change in fuel. It might end up being a mpg or two different. I can't do a good pull on it jet but so far it feels and sounds good. Can't wait to see the difference. I hear good things.

            JeremyG

            Year: 2007 Submodel: GT

            Helpful (7)

          • 4/5

            Installation Time: Afternoon

            Installation Cost: 0-$100

            March 14, 2018

            Solid Gears

            Got mine installed by a mechanic I know. Gears are silent as they should be. Great matchup for 2-5th. With the TR3650 its a little too slow of a gear for 1st. You basically shift out of 1st right off the bat unless you rev it out over 3000. I would not go any more aggressive than this for a street car because you'll find yourself shifting a lot. Mileage on the highway is not too bad. 80 mph yields just a hair under 2500rpm and 27-28mpg. My car is has hot rod cams, long tube headers, and a Paxton 1200SL non intercooled. ~8psi ~490-500whp on 91 octane

            StangManForever2008

            Year: 2008 Submodel: GT

            Helpful (14)

          • 5/5

            January 30, 2018

            great mod

            noticed big difference in acceleration as soon as you pull from the light,havent stomped on it yet,waiting for break in

            HurriahB

            Year: 2006 Submodel: GT

            Helpful (7)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            January 27, 2018

            Very happy w/the FRPP 3.73's!!

            I had OEM 3.73's on my former '08 Bullitt and loved them because they moved the powerband down low- lots better bottom end and quicker acceleration. My '14 GT Track Pack also came w/OEM 3.73's and loved them on that car for the same reason. IMHO, the OEM 3.31's on my '09 GT500 made the bottom end feel soft. The 'experts' cautioned me against 3.73's, citing that the KR model of the GT500 had 3.73's because of the larger wheel size to which I said, 'bunk.' I was also warned about the MPG issue, which I chuckled at. The increase in bottom end and roll-on power was immediate and significant and my MPG has actually gone up. The theory goes that your gas mileage will be grossly affected by 3.73's. Well, my Bullitt averaged 24-27 highway MPG, my '14 GT T/P was well over 22 highway MPG and I've actually noticed an INCREASE in highway MPG since the 3.73 gears were installed on the GT500. I'm guessing the engine is now sitting in the 'sweet spot,' especially during my daily commute, where the engine is running at near optimal performance. I've seen 25 MPG on some occasions but generally, the MPG has been up 2-3 MPG on the highway. I use to have to fill up every 2-3 days and now I'm getting at 4-5 days out of every tank. 3.73's are a win-win to me. I will caution buyers to NOT buy used 3.73's. Sadly, that was a lesson I learned that cost me time and $$. The used gears looked perfect, brandy new even, yet once installed, they could not be properly aligned and the dreaded whine was ever-present. I'd never buy used gears again, don't care how pretty they look. Spend the extra $$ and get new FRPP gears, as well as the proper type/amount of oil and ring/pinion installation kit. Lastly, and perhaps most importantly, make sure the shop you bring it to knows what it's doing. Nothing worse than listening to whining gears that were installed improperly.

            spectreman

            Year: 2009 Submodel: GT500

            Helpful (8)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            December 18, 2017

            It is what is Is.

            Good Fit. No complaints. Good Install by Dan the Man!

            GregM

            Year: 2006 Submodel: GT

            Helpful (5)

          • 3/5

            Installation Time: Afternoon

            November 20, 2017

            Ok quality.

            Picked up the ring and pinion at American Muscle which is really nice. Unfortunately, they required a lot of deburring and the fit wasn't as easy as I hoped. Finally got them within spec, but after breaking them in they were trash. The pattern wasn't where they should be and as a result I found a set of factory installed 3.73's which worked straight away and have been trouble free from the get go.

            Cup

            Year: 2008 Submodel: GT

            Helpful (5)

          • 5/5

            September 15, 2017

            Great mod

            Great seat of the pants feel! Car pulls harder off the line and when it kicks down to pass. Originally had 3.31 gears. These are super quiet, no noise at all.

            Sally

            Year: 2005 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            April 03, 2017

            Only thin I USE

            Ford Performance gears are all we try to use in my shop,we Install lots of Ring and pinions ,Ford is the best for the 8.8 and 7.5 Rears .not saying you cant get a bad set but its not often that happens.Ford Is on top of there game right now.If you want a wine buy Richmond or motive there good for that.

            Flipper

            Year: 2001 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            November 27, 2016

            Always a great upgrade!!!

            Have owned 48 mustangs in my time and one of the best upgrades is different gears in the rear!

            Trigr1

            Year: 2007 Submodel: GT500

            Helpful (6)

          • 5/5

            August 22, 2016

            I love it

            WOW.this Gear 3.7 makes my car run soooo fast. I can feel the change on the road and racing as well

            Rubu

            Year: 2007 Submodel: GT

            Helpful (7)

          • 3/5

            August 03, 2016

            Quality parts, speedy delivery.

            My rear end came apart in me one day, a couple of years after my supercharger install. This part was the fix to all my problems. The gear change combined with my LSD puts a constant smile on my face with all the tire burn out marks on the road. The neighbors absolutely hate me now.

            Redhorse

            Year: 2005 Submodel: V6

            Helpful (8)

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