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Motive Gear Performance Plus Ring and Pinion Gear Kit; 3.90 Gear Ratio (99-04 GT)

Item 21102G99
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      Product Information

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

      Features

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

      Description

      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. 3.90 gears are perfect for the Pony that needs more than 3.73s but less than 4.10s, offering a great blend of performance and efficiency.

      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 3.90 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

      Motive Gear F888390

      CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

      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


      Manual
      Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
      1 4065 5691        
      2 2405 3368 4330 5292 6254  
      3 1588 2223 2858 3493 4128 4763
      4 1203 1684 2165 2646 3127 3608
      5 818 1145 1472 1799 2126 2453


      Automatic
      Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
      1 3416 4782 6148      
      2 1864 2610 3355 4101 4847 5592
      3 1203 1684 2165 2646 3127 3608
      4 842 1179 1515 1852 2189 2526
      4.7

      Customer Reviews (100+)

        Reviews of Motive Gear Drivetrain products have an average rating of 4.7 out of 5

          Questions & Answers

          10 More Questions

          Will It Fit My Mustang

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

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