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Motive Gear Performance Plus Ring and Pinion Gear Kit - 3.73 Gear Ratio (99-04 V6)

Item 21107G99
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Superior Quality
      • CNC-Cut from 8620 Gear Steel
      • 3.73 Gear Ratio
      • 7.5" Ring Gear Diameter
      • For Street or Track Use
      • Fits 1999-2004 V6 Mustangs


      Improve Performance. Wake up your V6-powered pony for faster acceleration off the line with a set of 3.73 Motive Performance Plus gears. A steeper set of gears will get you into your power band faster for faster launches and more punch off the line.

      3.73 Gear Ratio
      . 3.73 gears are a great combination of performance and fuel economy that's ideal for a daily-driven 'Stang that sees a lot of highway time. If you put a lot of miles on your Pony and don't want to increase your cost at the pump, a 3.73 ratio will still give you the added acceleration you want without compromising fuel economy dramatically.

      Superior Construction. These Motive ring and pinon gears are CNC cut from high grade 8620 gear steel, and factory lapped for precision fit. Each set is hardness tested prior to leaving the factory to ensure the highest quality.

      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.

      This Motive Performance Plus Ring and Pinion Gear set will fit all 1999 to 2004 V6 Ford Mustangs 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

      MPN# F7.5-373

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (20)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 20 customers

      Installation Time: Weekend

      Installation Cost: $500-$1000

      • April 04, 2017

        5 2003 V6 - WilliamR Installation Time: Afternoon


        I installed these gears in my 2003 v6 mustang 5 speed along with an lsd with the help of my father in law. It took a few hours to do and is not the easiest mod to install but not to bad with the right tools and knowledge and definitely worth it all! It really peps up that v6 through every gear. I haven't had them installed long but so far so good. No noise very smooth all around great mod! I have a few more things I'll be doing very soon and we'll see how it all ties in. Very happy with these gears though!

        Helpful (6)
      • October 26, 2014

        5 1999 V6 - Mustangtim99 Installation Time: Shop Install Installation Cost: $500-$1000


        I have a lot of mods on my mustang! but this mod wakes it up!!!! I got this plus lsd and a light weight drive shaft! and she takes off!!!!. My mustang is an auto but will chirp tires when shifting LOVE THE POWER!!!!!!!!!!!!!!!!!!!!!!!!!

        Helpful (6)
      • May 20, 2014

        5 2000 V6 - Musty00 Installation Time: Full Day


        This product came in fast and looks great, there were no signs of it being used. I bought it for my son's mustang which he is still working on, just waiting for the differential to come in as the first one we bought from eBay was defected so we returned it and then bought another from American muscle! Should be in today! Can't wait to have them put it on to start driving my son's musty again!!

        Helpful (4)
      • April 18, 2012

        5 2003 V6 - Paull Installation Time: Shop Install


        I got these for my 2003 v6 and it was definitely worth it. Having these put in was definitely one of the best installs i have done so far. Thanks

        Helpful (5)
      • May 15, 2011

        5 2001 V6 - Dominic

        Motive Performance Plus 3.73 Gears (99-04 V6)

        I ordered these gears with an install/bearing kit for my 01 V6 Convertible and WOW! what a difference it made. Don't fet me wrong it's still not my GT but it really woke it up! Great upgrade and bang for the buck!

        Helpful (6)
      • April 19, 2011

        5 2001 V6 - dakota

        V6 Auto w. TLok

        Major improvement in acceleration. I installed these myself which saves me a lot of money, and it wasnt to hard to install just have to make sure backlash and preload is correct or else they will whine. If your like me and you want hard launches get the 4.10 gears or upgrade the rear end to a 8.8 and get even higher gears. I really like these gears but wished i swapped rear ends and wint with 4.30 gears.

        Helpful (7)
      • March 16, 2011

        5 2000 V6 - shawn

        well worth the money

        I added this to my stang along with a ford racing tlok and a 4 bank elim chip. i must say installing all of it was a process. make sure you get the right backlash in the gears and compound mesh and your set. id get professional help if you dont have the tools. great acceleration and performance. makes GTs jealous now

        Helpful (4)
      • February 17, 2011

        4 - Brad Coxe

        Woke the pony up!

        This was a great product. Made my V6 really fly.. Only thing I didn't like is that it didn't come with and spacers or any of the bearings or crush collar that are pretty much mandatory. I wouldn't recommend doing rhis yourself unless you are a very experienced tech with a hoist. Don't count on finishing it in 1 day either. Took 2 buddies and I 2 7 hr. Days with a hoist. Very pleased with the product thus far. Just doin the 500 mile break in.

        Helpful (4)
      • January 11, 2011

        5 2000 V6 - justin p

        big time must

        got this 3.73...came from factory 3.27...2000 v6 mustang 5sp... i only lost 300 rpms..65mph is now 2250 rpms..factory was 1950... definatly is a whole lot quicker getting into the "power band" also got the t-lok with thing i have done so far to this car..well other than getting the wireless tuner for it :) thanks AM !!

        Helpful (13)
      • January 02, 2011

        5 - Johnathon May

        More Get Up And Go!!!!

        Bought and had these installed by a professional in my 5 speed 2000 v6 mustang along with the 7.5 28 T-LOK slip differential and felt the difference immediately. A must buy for anyone with a v6 looking for better acceleration and handling, their even better when combined with a custom tune. For those of you who want to buy the gears and the T-LOK and are wondering how much it will cost at a garage to have BOTH installed it will be around $500.00-$600.00 just for installation but worth it.

        Helpful (5)

      Questions & Answers (4 answers)

      4 Top Rated Questions

      Do you really need a tune after ?

      • I have 4.10 gears in my gt I drove it for a while before tuning the only major problem is it makes Ur speedometer wrong it says your going faster then you really are, but it is very drivable without a tune

      Helpful (4) Show 1 more answer

      I'm thinking about getting this for my 03 auto V6 mustang and was wondering what is everthing I need to install this properly?

      • You will need to purchase the Motive Rear End Installation and Bearing Kit Item #21202 ( along with new rear differential fluid. The Ring and Gear Pinion kit will require a notched cross-pin for proper installation, and the speedometer will have to be re-calibrated as well.

      Helpful (1)

      or 4.10 I have a v6 daily driver. Do minimal high way driving. Which set would go best?

      • The 3.73s are a good all around choice for a pushrod motor.

      Helpful (1) Show 2 more answers

      will there's gears fit is a stock rear end or do i have to get a bigger rear end?

      • These new gears will fit in your stock rear without any problems. Installing these will throw off your speedo though, so I recommend getting a new tune to correct for that. Also, it's a great idea to get the installation and bearing kit and the necessary gear oil for a perfect install. Combining these gears with an LSD would be an awesome combo for your V6, putting all your power to the pavement and eliminating those 1 wheel burnouts! Best of luck!

      Helpful (0) Show 1 more answer
      Post Your Question

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Ring gear
      • (1) Pinion gear

      Tech Specs

      Will It Fit My Mustang

      • V6 - 99, 00, 01, 02, 03, 04

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