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Ford Performance 3.73 Gears (99-04 V6)

AmericanMuscle no longer carries the Ford Performance 3.73 Gears (99-04 V6). Please check out 1999-2004 Mustang Gears for an updated selection.
Market Price $215.04 You Save 13% ($28.05)

$186.99

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  • Item 50351G99
  • MPN# M-4209-75373

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AmericanMuscle no longer carries the Ford Performance 3.73 Gears (99-04 V6). Please check out 1999-2004 Mustang Gears for an updated selection.

Features, Video & Details

  • Ford Racing Quality
  • Strong Forged Construction
  • 3.73 Gear Ratio
  • 7.5" Ring Gear Diameter
  • For Street or Track Use
  • Fits 1999-2004 V6 Mustangs

Review & Installation Video

Review & Install Video

JUSTIN: Hey I'm Justin with AmericanMuscle.com and this is our PowerPack Bolt-On Build-Up for all 99-04 V6 Mustangs. Now, before we get started, let's address the elephant in the room. From the factory, these 3.8 L V6s weren't the baddest Mustangs on the block, just in terms of all-out performance. But thanks to the large aftermarket support, and bolt-ons that can really squeeze every ounce of power out of any car, well these V6s can be turned into quite the competent little street-car. So that's exactly what we're going to show you here today. But before we get into it, we're going to grab a quick baseline number first just to see what we're starting with. Then we're going to hand the car over to the crew, to get everything installed. JUSTIN: Hey Mike, what's up man? MIKE: Oh, nothing much, man, what's going on? JUSTIN: It looks like we tackled some of the basics under here, I see that SR Performance Cold Air Intake, now obviously that's going to get us a little power of course, but maybe explain to us, maybe what else we can expect from using stuff like that? MIKE: Well first is price, it's a very budget-friendly piece. It's easy to install, looks great, it's no-tune required, and we should see some increase in miles-per-gallon too. JUSTIN: All right, cool, man. Now I notice a little yellow under the hood here as well, that's usually the calling card of Accel products. Tell us a bit more about this Super Coil Pack here. MIKE: You're going to get some horsepower & torque as well on this, but the main thing it's going to smooth out our idle, give us better drive-ability and give us a cleaner, hotter spark. JUSTIN: That's probably pretty important with an older car, such as this. MIKE: Absolutely. JUSTIN: Right on, man. Now I also know we've got the Pipes True Dual system on the car, that's been on for a little while, we're not going to lie, being car guys, this car didn't have much of a chance coming in here with a single exhaust. MIKE: Oh yeah. JUSTIN: So, talk about the benefits of a True Dual system on our V6. MIKE: It's going to increase horsepower and torque, more importantly for most of the guys, it's going to increase the sound, it's an aggressive sound, it's high-quality and it's also easy to install. JUSTIN: Now what's a Mustang without dual-exhaust coming out the back too, right? MIKE: Exactly. JUSTIN: Now, finally, I guess we can be safe to assume you're going to toss one of your custom Bama tunes into the mix? MIKE: Oh yeah. JUSTIN: Awesome man, now what's that going to do for us? MIKE: going to wrap all of our mods together, and make it a complete package. The fuel, the spark, the cooling fans, and being that it's an automatic, we're going to adjust the shift firmness, and the shift links. JUSTIN: Alright man, I guess there's only one more thing to do. You ready to see how much power this little 3.8's going to make? MIKE: Let's do it. JUSTIN: Alright. JUSTIN: So our baseline run with our 2006 V6 gave us 149 horsepower & 185 ft/lbs of torque. With our power pack installed we put down 163 horsepower & 192 ft/lbs of torque, giving us a peak horsepower gain of 14 over our baseline numbers, and gains of 15 horsepower and 15 ft/lbs of torque throughout the curve. Now it's obvious Mike was able to work his magic with the bolt-ons and the tune, but we wanted to give our V6 a little more giddy-up. So we installed a set of Ford Racing 373 gears along with Auburn's limited slip differential, now of course the gears are going to give us that increased acceleration we're looking for, but the diff's going to be equally as important. The limited-slip differential's going to distribute power to both wheels evenly, help us get off the line, and pull us out of the turns but, most importantly, no more embarrassing one-wheel peels. Alright, with everything wrapped up, let's get our V6 off the dyno and on to the streets so we can see how it does with all that new power, along with those acceleration goodies. JUSTIN: So we're back out in our 2000 V6, after the PowerPack's been installed, and we'll just get one thing out of the way, right away. Is our V6 faster than the GT500? Absolutely not, but that's not a big surprise. What I will tell you though, is that our V6 is significantly quicker all around. The acceleration pulls from, pretty much idle, all the way to redline now, as opposed to before, when it kind of fell on its face around 4000 rpms, 'cause it was just kind of being choked out by the single exhaust, and the puny intake. Now the intake is letting it breathe, the dual exhaust is really flowing well, sounds great by the way, for a V6, and the Bama tune's just really pulling it all together. Our acceleration, by the way, is killer. That Auburn LSD along with our 373s, have really made for one peppy daily driver. In the end, V6, much more improved driving experience. That's what we were going for with this Power Pack, and we really did a good job with our little 3.8 L here. So that wraps up our Power Pack for our V6 Mustang. Be sure to check out some of our other 99-04 V6 Bolt-On Build-ups, where we dress up our V6 a little bit, and work on our handling.

Improve ET's And Low End Torque. Are you looking to get more low end grunt off the line and lower your 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 3.73 Ring and Pinion Gear set will fit all 1999 to 2004 V6 Mustang models equipped with a 7.5" rear end. A master bearing kit is recommended by most installers, especially on high mileage vehicles, see drop down option above.

Installation note. The Ring and Gear Pinion kit will require a notched cross-pin for proper installation.

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.

Fitment: 1999 2000 2001 2002 2003 2004 Details

What's in the Box
  • (1) Ring gear
  • (1) Pinion gear
Installation Info
Will it fit my Mustang?
  • V6 - 99, 00, 01, 02, 03, 04

Most Helpful Reviews

5/5
feel the power!

i have a 2000 v6 with sr preformance CAI, accel super coil pack, msd 8.5 wires, duel exhaust with H-pipe and 2 flowmaster 40. i just added these Ford Racing 3.73's and a possi... all i have to say is... ...

Read More
Helpful (3)

5/5
Good product

I'd got these along with an Auburn limited slip differential and they've really given the car an excellent kick both off the line and overall. I've just got them installed in the car and have gone through ...

Read More
Helpful (1)

Overall Rating 5 out of 5 stars
Read All 10 Reviews

Customer Photos

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6 Questions / 9 Answers

Ask a Question

I have question about which gears are better for automatics 3.73 or 4.10? I've heard some people say that 4.10 gears are better for automatics and that 3.73 gears are more for manuals, what is the difference between the two gears and which one would be more beneficial for my automatic 1999 v6?

Blackwolf

  • Well it all depends on what your looking for... If your looking for acceleration go with 4.10 If its a daily driver I'd recommend the 3.73 Just because you'll have better MPG.

    Trevor9

    Good Answer (9) (0)

Show 2 more answers Question Resolved

Do I need to buy the bearing kit? Do I need to buy the 7.5 bearing kit in order to install the 3.73 gears?

cameron37

  • Yes, you should buy the kit cause the old ones are maybe worn. it best to do this cause you don't want to have this job done again .

    BKIRV

    Good Answer (0) (0)

Answer This Question I need this answered (0) (0)

Installation Cost? I am not a mechanic, so i would be taking my car to a shop to get this done. Anyone else do this and know around what they charge for this?

deanebs

  • Installation generally costs between $300 and $500. This all depends on if you purchase all the parts needed before you bring your car to the shop. I highly recommend purchasing the gear set along with fluid and a master install kit. The install kit comes with all needed hardware and gaskets.

    Raptor62

    Good Answer (1) (0)

Answer This Question I need this answered (0) (0)

Speedometer recalibration Do i really need a Speedometer recalibration tool for 3.73's? Would a tune fix that issue or is there another solution to it?

Ziko

  • If you already have a custom tuner, you do not need the recalibration tool. The tuner can be updated for the rear gear swap to correct your speedometer! You would just need to request an updated tune via phone or the site. Hope this helps!

    LisaS

    Good Answer (7) (0)

Question Resolved

Will this lower my top speed? i have heard that this could lower my top speed is this true? if so are there any better gears to keep my top speed up but increase my acceleration?

Tommy02

  • Tommy02, acceleration and speed are a direct negative correlation when it comes to your final drive gear. If you get higher ratio, relative top speed will go down no matter what. Likewise, if you lower the ratio, relative acceleration will go down no matter what. However, you really shouldn't be worried about your top speed because were talking only little difference and you'll probably never feel it unless you do 150mph on your way to work everyday. However, what you will feel is decrease in fuel economy with higher ratio in the long-term. Honestly, if you want to have some fun get it. Fuel economy and mustang doesn't belong in the same sentence. A good median is 3.55; that's what im running in mine.

    Flyer01

    Good Answer (1) (0)

Show 1 more answer Answer This Question I need this answered (0) (0)

rpm difference? how big is the difference when i am cruzing on the highway going 70mph? stock 70mph for me is 2000rpm. i heard with the 373 it is 3000? i would like to kno if this is better for my 2000 v6 or sticking with stock i dont want to loose gas for my work commute everyday on the highway.

ElLoco

  • If you are that seriously worried about fuel economy, then don't get this. However, if you are willing to budge on that a little and listen to that naughty voice in your heart throbbing and begging for more "umph," get it. I run a 3.55 in my 2007 GT and I still get 25-30 MPG on the highway. In all seriousness, it depends on your driving habit. Even if you have an efficient car, if you have lead for a foot, it will get bad milage. Jeremy Clark from Top Gear actually proved this by comparing a BMW with (I think) a Yaris.

    Flyer01

    Good Answer (3) (0)

Answer This Question I need this answered (0) (0)

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Customer Reviews (10) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

  • Performance Gain 5 5
  • Fit 4.7 4.7



  • 5/5

    Installation Time: Afternoon

    March 29, 2013

    feel the power!

    i have a 2000 v6 with sr preformance CAI, accel super coil pack, msd 8.5 wires, duel exhaust with H-pipe and 2 flowmaster 40. i just added these Ford Racing 3.73's and a possi... all i have to say is... WOW!!!!! my car was already getting ok power but with these 3.73 and the possi togeather it really brings my poney to life! im able to launch better, get off the line faster, and recover from the turns alot better, i get better traction from both wheels, and it really throwes me back in my seat now :) it dose not feel like im driving a v6 no more! and gas is ok on it too. not a big difference. im so glad i got these 3.73 it is well worth the money!!!!! thank you AM!!!!

    ElLoco

    Year: 2000 Submodel: V6 San Antonio, TX, USA

    Helpful (3) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    February 21, 2014

    NICE INVESTMENT

    Good price makes my car feel like a sleeper and faster than the regular v6

    Bishop600

    Year: 2002 Submodel: V6 Texas, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    February 21, 2014

    much more fun to drive

    With these 373 gears you can feel the difference while driving down the road as for being my daily driver I would recommend this product to anyone who is looking for a gear swap

    millo925

    Year: 2003 Submodel: V6 Stockton, CA, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Weekend

    November 23, 2013

    Great launch

    Along with a cold air intake and AM msd performance coil pack and 8.5 mm wires this product has mad a huge difference in my v6 stang. Faster launches and a lot more low end power. Not the easiest install for beginners but with proper help this is a great mod for any v6. Thanks AM

    00v6mustang

    Year: 2000 Submodel: V6 Louisville, KY, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    August 15, 2013

    Just the right gear

    Went from stock to 4.10 to 3.73. I had the 3.73 a long time ago and wanted to see how the 4.10 was. Loved the quickness but the revs were way too much. I'd need 7 speed to handle that gear. 3.73 is great, gets me moving. Anyone want to buy a 4.10 that was in for about 5 months?

    welxx

    Year: 2000 Submodel: V6 Gilbert, AZ, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    May 20, 2013

    Good product

    I'd got these along with an Auburn limited slip differential and they've really given the car an excellent kick both off the line and overall. I've just got them installed in the car and have gone through with the break-in period, so I can't attest to the long term durability of the gears, but they're Ford Racing and are quality products. No gear whine so far either, but i'm also running Ford Racing friction modifier and Royal Purple diff fluid.

    RyanCoke

    Year: 1999 Submodel: V6 Winnipeg, MB

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    July 18, 2012

    nice gear for the street

    love it and it did not hurt my gas miles, it moves a lot nicer out of the hole plentey of get up and go now.

    dullblade12

    Year: 2001 Submodel: V6 rittman ohio

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    July 26, 2013

    WOW!!!!!!

    All I have to say is wow. The gears really woke my car up out of the hole. No longer do I launch and feel a pause for the car to catch up. It has a lot more even pull and once I combined this with the tune that Bama was quick to give me I am very pleased and no its too much for my tires ha burns through all gears.

    Eric21

    Year: 2004 Submodel: V6 Plainview, TX

    Helpful (1) (1)

  • 5/5

    Installation Time: Afternoon

    November 23, 2013

    amazing acceleration

    This product shipped to me wednesday I installed it thursday. I test drove to see the gains and what a difference it made.

    zach42

    Year: 2000 Submodel: V6 Maine, USA

    Helpful (0) (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    November 08, 2012

    3.73 Gear up grade

    the overall performance is outstanding. It comes out of the hole so much better than with the stock gears. This is with a 2000 Mustang v6 automatic. i have done so many things to this automobile, and ninth percent of all the parts have been purchased from american muscle, which I am completly satified with. Thank you for all your help and assistance, for I could have not compleated this task without you.

    stangone

    Year: 2000 Submodel: V6 Hialeah Florida

    Helpful (1) (4)

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