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Motive Gear Performance Plus Ring Gear and Pinion Kit - 4.56 Gear Ratio (99-04 GT)

Item 21108G99
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Ship to: Ashburn - 20149
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      Product Information

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


      • Superior Quality
      • CNC-Cut from 8620 Gear Steel
      • 4.56 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. Improve your V8-powered Mustang's off-the-line responsiveness with a set of 4.56 gears from Motive. These high quality 4.56 gears from Motive will give your Mustang more pull off the line and get you into your power band faster for quicker quarters and lower ET's.

      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.

      This Motive Performance Plus 4.56 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.

      Please Note. Due to the high numeric gear ratio, it will require a notched gear 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. 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# F888456

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (3)

      Write a Review

      Ratings Summary

      5 out of 5 overall rating from 3 customers

      Installation Time: Shop Install

      • September 30, 2011

        5 2003 Mach 1 - PUBLICE1 Installation Time: Shop Install


        I have an 03 mach 1 and these gears fit great! I had originally ordered a set of richmond excel's. they did not fit with the stock cover or any other after market cover I tried. The richmonds were to thick. And no one not even the manufacturer could tell me why. The install was done at ford and checked multiple times by different mechanics. I would strongly recommend these over the richmond! The performance gain was also worth the trouble I went through!

        Helpful (5)
      • January 10, 2010

        5 - Greg

        Awesome Gears

        Awesome gears for the Mach 1. I did cams and needed to get back some of the lower band power! These did the trick! Car feels like it is ready to move out at whatever rpm you are at. Works great on the street and the strip.

        Helpful (3)
      • December 14, 2009

        5 - Sean


        These are some fun gears if you have an auto trans. I dont drive on the highway to much but you can for sure. The gas millage isnt good highway but city its not to much worse.

        Helpful (4)

      Questions & Answers (1 answers)

      1 Top Rated Question

      Can I install this on an automatic? If so, will it affect my transmission?

      • The Motive Performance Plus 4.56 Gears (99-04 GT) will be able to fit in an automatic transmission. It will also affect the RPM's in your car. For more information about what your new RPM rating will be at certain speeds, check out the information under "Tech Specs."

      Helpful (0)
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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 4753 6654        
      2 2812 3937 5062 6187    
      3 1856 2599 3341 4084 4826 5569
      4 1406 1969 2531 3094 3656 4219
      5 956 1339 1721 2104 2486 2869

      Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
      1 3994 5591        
      2 2180 3051 3923 4795 5667 6539
      3 1406 1969 2531 3094 3656 4219
      4 984 1378 1772 2166 2559 2953

      Will It Fit My Mustang

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

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