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Ford Racing 3.73 Gears (05-09 GT)

55 Reviews
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  • Item #24001G05
  • MPN #M-4209-F373N
  • Market Price $173.99
  • You Save 17% ($29.01)
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  • 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
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.

Mustang Fitment: 2005 2006 2007 2008 2009 Details

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

Approximate RPM for 2005-2010 GT

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

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
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09
  • GT500 - 07, 08, 09

Most Helpful Reviews View All

Overall Rating 4.9/5 Write a Review
Great improvement for your stang

I know the easiest way for me to have great low end was to buy gears. I choose 3.73 beacse my stang is also a daily driver. I am 18 years old and a mechanic at ford. This took me 1 hour to install. And

Read More
Helpful (11) (0)

Perfect with Cams

I recently added FRPP hot rod cams in my 08 automatic mustang with 3.31 gears. It was almost impossible to drive slow around town, the car would buck and jerk and i lost almost all low-end power as the

Read More
Helpful (6) (0)

Customer Photos (3) View All

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Q & A (3 Questions, 13 Answers) Ask a Question

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

youngstangfan Year: 2007 Model: GT

Question Resolved
Good Question (0) (0)
  • They would be a somewhat noticeable gain, that's a good gear to get. Allows many options when deciding if you want to stay NA or go FI

    Helpful (2) (0)

    Best Answer

    zjhon33 Year: 2010 Model: GT

Show 3 more 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!

DAO3 Year: 2006 Model: GT

Question Resolved
Good Question (0) (0)
  • When you install a different gear ratio, it will throw off your speedometer reading. So in order to correct that, you'd need to either get a custom tune or purchase the speedometer recalibration tool. Of the two, I'd highly recommend getting a custom tuner. Reason being, not only will you correct your speedometer, but you'll see performance gains from any and all bolt-on mods you may have made or plan on making in the future. Custom tunes can even help with performance gains on a stock Mustang and helps to improve gas mileage. Check out the link below for more details! Hope this helps to answer your question!

    Helpful (1) (0)

    Best Answer

    LisaS Year: 1992 Model: GT

Show 3 more answers

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?

Ubnbit Year: 2007 Model: GT500

Question Resolved
Good Question (0) (0)
  • Yes you will. I changed from 3.55 gears in my 07 GT to Ford Racing 4.10 gears and it really woke the car up!! Much quicker off the line and little to no difference in gas mileage.

    Helpful (2) (0)

    Best Answer

    07stanggt Year: 2007 Model: GT

    Top 500 Contributor

Show 4 more answers

Reviews (55) Write a Review

  • 5 Stars .89 89%
  • 4 Stars .09 9%
  • 3 Stars 0 0%
  • 2 Stars .02 2%
  • 1 Stars 0 0%

out of 5 stars

54 Customers Recommend this Product

Installation Time:Weekend

Installation Cost:$250-$500

  • Performance Gain: 4.736842 4.7/5
  • Fit: 4.894737 4.9/5
  • Bang For Your Buck: 4.894737 4.9/5
Filter By Sort By
  • 5/5

    Great improvement for your stang

    October 09, 2011

    I know the easiest way for me to have great low end was to buy gears. I choose 3.73 beacse my stang is also a daily driver. I am 18 years old and a mechanic at ford. This took me 1 hour to install. And if you do everything right you wont hear any noise. I didnt need to use the shims that came with the kit becase the pinion depth is set by the factory. I also used the old pinion bearing from the factory pinion. and if you guys ever want to use a new bearing dont just install the bearing and not install the race. Cuz ford redesign the bearing and the factory race is way bigger than the redesigned. Backlash was not an issue for Me. Everythin fit right and i dont hear any noise at all from the new gears. Now i crush ls1's with simple bolt ons.


    Year: 2005 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Arlington, VA

    Helpful (11) (0)

  • 5/5

    Perfect with Cams

    June 09, 2012

    I recently added FRPP hot rod cams in my 08 automatic mustang with 3.31 gears. It was almost impossible to drive slow around town, the car would buck and jerk and i lost almost all low-end power as the cams like to keep the car in higher gears. Well after installing the 3.73 gears my car run AMAZING. Good low end power for driving around town and getting off the line but the mid-range power is where the car really comes alive and doing 80 on the highway my car is at 2500 rpms. My car is now a beast and I recommend these to anyone installing cams who drive their car daily. They're perfect!


    Year: 2008 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 NJ

    Helpful (6) (0)

  • 5/5


    October 24, 2009

    Wow these gears amazing. I have an automatic and these gears made a HUGE difference. Thank you Ford Racing and American Muscle.


    Helpful (5) (0)

  • 5/5

    FRPP 3.73

    July 18, 2009

    These gears are perfect for my combo, they now sit behind a 450+hp engine and holding fine.

    Jeff Bailey

    Helpful (4) (0)

  • 5/5

    Great upgrade

    April 17, 2012

    I bought these gears for my '07 Gt (5 speed) with 3 goals in mind. 1: Increase performance 2: reduce my excessive highway cruising speed 3: reduce or eliminate a drone from my axle back exhaust My shop did the installation and there is absolutely no noise from these gears. I re calibrated the speedometer with my Diablo tuner in 5 minutes and corrected the 10 mph error from the new ratio. The exhaust drone that I had on the highway from 60 to 70 mph is totally gone and I no longer find my speed creeping up to escape from the noise. My fuel economy as calculated by the cars computer is 25.5 mpg with the cruise control set to 68 mph. ( I have a C&L cai, Diablo 93 octane tune, under drive pulleys and Ford Racing axle back exhaust). Creeping in slow traffic is easier now and top gear acceleration from 70 to 100+ mph is more impressive. The 3:73 gears really compliment my engine and suspension mods. Yes l like to blast through the gears but I don't need to cruise at 80 anymore to enjoy the sound of the axle back stingers. Mission accomplished!

    Top 1000 Contributor


    Year: 2007 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Ct.

    Helpful (2) (0)

  • 5/5

    Respect the Throttle

    February 07, 2012

    I spent a lot of time mulling over whether or not to make this investment. After consulting the pros and cons of swapping the rear gears, I pulled the trigger. Cost me $350 for installation from West Coast Ring and Pinion in Rancho Cordova, CA. The question I had after deciding to do it was whether to go 3.55 or 3.73. I have too much highway driving to justify 4.10’s, as the RPM would just have the engine singing too much. After discussing the issue with West Coast, I went for the 3.73's. West Coast did not have the flash tuner to correct the speedo and shift points, but assured me no damage would occur from a rear end swap. I will have the annoyance of having to do the math all the time, but that is about it. As far as shift points go, I find no difference. The automatic seems to shift out at the same points under WOT sprints. Now, in mild driving, it does shift up quicker, but that is about it. The car snaps off the line, stands on its tail at any speed I mash the pedal and just makes the ride even more exhilarating. So far the gas mileage hasn’t been affected much. It dropped some highway miles by about 2-3 on long 75-80mph interstate runs (was about 24-25 and now about 22-23), but the city mileage has pretty much remained the same (hard to gauge with all the sprinting vs. mild mannered mix) The problem I gotta fix now (besides the speedo correction) is the pronounced rear squat. The snap is that much more over the 3.31’s that the rear pushes down even harder, which is annoying. It is a pain to have to drive by RPM. According to a roadside radar display, looks like I am off nearly 10mph now.

    Top 500 Contributor


    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Loomis, CA

    Helpful (2) (0)

  • 5/5


    September 11, 2008

    Just what my car needed. Combined with my supercharger, I can really feel the torque. 3.73s are the way to go.


    Helpful (2) (0)

  • 4/5

    respectable product

    November 21, 2007

    My first mod, and I can feel the difference.. and not to mention a lot cheaper than other web sites!!!!


    Helpful (2) (0)

  • 5/5

    Gears, Gears

    April 14, 2010

    Don't fear the gear is correct. I couldn't of said it better. Gas shouldn't be a factor when your driving around in a V8 it's obvious.To those who are concerned don't be. I was too and I must say it was worth the labor. Gas mileage is nothing compared to what you get out of these. If you like to go faster...faster then swap your stock ones for these. I did and already I am regretting not getting the 4:10's. 1st and third never felt better.Thanks AM


    Helpful (3) (1)

  • 4/5

    Great bang for the buck

    August 29, 2011

    The installation took me about 8 hours because the darn thing refused to shim out correctly. And even when I got the marks looking perfect on the gear I still have a whine on coast side between 45 and 55 mph. I've gotten used to it. Apparently some of it comes down to the cut of the gear. Ford RACING is meant for just that racing. They do not cut the gears for being quiet. So it is very hard to avoid some sort of whine after install.


    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Exton, PA

    Helpful (3) (2)

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