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

Item 21105G99
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Ship to: Ashburn - 20149
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      Product Information

      Features, Description, Reviews, Specs & Installation


      • Superior Quality
      • CNC-Cut from 8620 Gear Steel
      • 3.73 Gear Ratio
      • 8.8" Ring Gear Diameter
      • For Street or Track Use
      • Fits 1999-2004 GT, Bullitt, Mach 1 and Cobra Mustangs


      Improve Overall Performance. A set of Motive Performance gears will wake up your Pony and get it moving faster off the line. Steeper gears are a great way to lower quarter mile times and improve responsiveness without sacrificing driveability. 3.73 gears is a great addition to daily driver, automatic transmission Mustangs, offering a superior combination of performance without sacrificing fuel economy.

      Superior Construction & Precision Fit. 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. Unlike other brands, Motive Gears do not have a reputation for "gear whine".

      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 Motive Performance Plus 3.73 Ring and Pinion Gear set will fit all 1999 to 2004 V8 Mustangs including the GT, Bullitt, Mach 1 and Cobra models. A master bearing kit is recommended by most installers, especially on high mileage vehicles, 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: 1999 2000 2001 2002 2003 2004 Details

      MPN# F888373

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (9)

      Write a Review

      Ratings Summary

      4.7 out of 5 overall rating from 9 customers

      Installation Time: Weekend

      Installation Cost: $500-$1000

      • September 13, 2017

        3 2002 GT - Dave99 Installation Time: Full Day

        Good improvement in acceleration

        Getting a lot of whine.Not sure if it is the product or the install.Will have to have it checked to make sure.

        Helpful (3)
      • August 22, 2017

        5 2002 GT - CarlosS Installation Time: Shop Install Installation Cost: $500-$1000

        Gears is a must.

        Very nice gears looks just as good as ford if not better. Pulls are a big improvement. Love them so far.

        Helpful (3)
      • July 19, 2016

        4 2002 GT - Robert


        I like the gears and intake, now I need to get my lowering springs soon.

        Helpful (4)
      • August 22, 2013

        5 2002 GT - Cornbread68 Installation Time: Full Day

        Awesome product

        Could not ask for a better fit. Thank you to Motive and American Muscle for a quality product at a great price.Car is no longer sluggish and launches out of the hole now.

        Helpful (3)
      • July 29, 2011

        5 2002 GT - Jordan

        Great for the Price

        These are some magnificent gears! No gear whine at all, they are so smooth they make my 02 GT feel like a caddi! Install was a breeze, remember to get the bearing rebuild kit and traction lok kit when you purchase these.

        Helpful (4)
      • February 19, 2011

        5 - Ron

        great product

        I love these gears I would tell anyone who asked to get these for there car .The install was fairly easy just remember to buy a complete install kit and when doing the install keep parts that you use again marked and they go back to where they came from.

        Helpful (5)
      • March 20, 2010

        5 - Jason

        Just what I needed

        Oh my god, can't believe I waited this long to get these gears.What a difference especially paired with the diablo 04 gt is a complete animal thanks AM. ps. make sure you get the motive bearing kit, makes the install that much easier.

        Helpful (4)
      • February 20, 2010

        5 - Kris p.

        Good bang for your buck

        I bought these gears about 3 years ago and they are very nice. there isnt gear whine like richmond as long as they are both shimmed correctly. you can def feel the get up and go vs the stockers. You will have to buy either a speed cal or new speedo gear if you have a mechanical speedo.

        Helpful (4)
      • August 10, 2008

        5 - Brian

        Great product

        This gear is perfect for all around driving, and doesnt whine like other gears and definately has the pickup when you want it!!!

        Helpful (4)

      Questions & Answers (0 answers)

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      Installation & What's in the Box

      Installation Info

      What's in the Box

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

      Tech Specs

      Approximate RPM for 1999-2004 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 1480 1721 2034 2347

      Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
      1 3267 4573 5880      
      2 1783 2496 3209 3922 4636 5349
      3 1150 1610 2070 2531 2991 3451
      4 805 1127 1449 1771 2093 2416

      Will It Fit My Mustang

      • Bullitt - 01
      • GT - 99, 00, 01, 02, 03, 04

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