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Motive Gear Performance Plus Ring and Pinion Gear Kit; 3.90 Gear Ratio (86-93 GT)

Item 21102G87
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      Product Information

      Features, Description, 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 1986-1993 GT and 5.0 LX 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 new Speedometer Gear is an inexpensive way to fix this issue.

      Application. This Motive Performance Plus 3.90 Ring and Pinion Gear set will fit all 1986 to 1993 V8 Mustangs including the GT, LX 5.0 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: 1986 1987 1988 1989 1990 1991 1992 1993 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 1986-1993 GT


      Manual
      Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
      1 4053 5674        
      2 2393 3351 4308 5265 6223  
      3 1600 2239 2879 3519 4159 4799
      4 1203 1684 2165 2646 3127 3608
      5 806 1128 1450 1773 2095 2417


      Automatic
      Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
      1 2886 4041 5196 6350    
      2 1764 2470 3175 3881 4586 5292
      3 1203 1684 2165 2646 3127 3608
      4 802 1123 1443 1764 2085 2405
      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

          • GT - 87, 88, 89, 90, 91, 92, 93
          • LX - 87, 88, 89, 90, 91, 92, 93
          • Other - 86

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