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Motive Gear Performance Plus Ring and Pinion Gear Kit - 3.90 Gear Ratio (11-14 V6; 86-14 V8, Excluding 13-14 GT500)

Item 21102
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      Product Information

      Features, Description, Reviews, Specs & Installation

      Features

      • CNC-Cut from 8620 Gear Steel
      • For Street or Track Use
      • Superior Quality
      • 3.90 Gear Ratio
      • 8.8" Ring Gear Diameter
      • Fits 1986-2014 V8 and 2011-2014 V6 (Excludes 2013-2014 GT500)

      Description

      Improve Overall Performance. Improve your V8-powered Mustang's off-the-line responsiveness with a set of 3.90 gears from Motive. These 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 (94-10) is an inexpensive way to fix this issue.

      Application. This Motive Performance Plus Ring and Pinion Gear set will fit all 1986 to 2014 V8 Mustangs including GT, Bullitt, Mach 1, Cobra and the 11-14 V6 Mustangs equipped with the 8.8" rear end. A master bearing kit is recommended by most installers, especially on high mileage vehicles, see drop down option above.

      Attention 2010 and newer Mustang Owners. Starting in 2010 Ford changed the inner rear gear pinion bearing in all 8.8" equipped Mustangs. Because of this you will require a new 8.8" rear gear pinion bearing (Ford part# 9L3Z-4630-A) for proper installation, please 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. A master bearing kit is recommended by most installers, especially on high mileage vehicles, see drop down option above.

      Installation & Tech
      Differential Gears - Installation Instructions! Differential Gears - Installation Instructions! Mustang Rear Gears - Tech Article Mustang Rear Gears - Tech Article

      Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Details

      MPN# F888390

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

      3.8

      Customer Reviews (9)

      Write a Review

      Ratings Summary

      3.8 out of 5 overall rating from 9 customers

      Installation Time: Weekend

      Installation Cost: $100-$250





      • March 25, 2019

        5 2004 GT - BrianJ Installation Time: Afternoon

        Motive ring and pinion

        Easy install gear pattern was right on first setup no noise great set of gears

        Helpful (0)
      • August 24, 2018

        1 2007 GT - HalH Installation Time: Shop Install Installation Cost: $100-$250

        Motive 390 Gears

        The Motive 390 gears was installed by a professional and the gears seemed like they had not been hardened properly they began to whine very loud and I had to take it back and He installed ford 373 gears and they worked great. America Muscle did refund my money and I bought 373 gears from them.

        Helpful (5)
      • August 02, 2017

        2 2005 GT - tdonahu2 Installation Time: Shop Install Installation Cost: $250-$500

        3.90

        This Brand of Gears is a low quality. Very, very noisy. Not a smooth ride with these gears. Recommendation not to buy these gears.

        Helpful (7)
      • July 14, 2010

        3 1990 - Matt

        390

        Had gear professionally installed, greater acceleration and higher rpms, unfortunately the gear whines, would recommend ford racing, but they dont make a 390 so i chose motive because i wanted a 390, ill live w it

        Helpful (11)
      • June 02, 2010

        5 - chalmers

        perfect gear

        great gear not to low like 410s but still feels better then 373s.. i had gotten a rebuild kit with the gears.. i have not had any whine unless in reverse..

        Helpful (11)
      • March 07, 2010

        5 2002 GT - Kevin

        crazy..

        The only word to describe these gears is crazy! They gave my '02 GT so much more life. I had a hard time deciding between 373s and 410s, so i just went with these and i am glad i did!

        Helpful (17)
      • December 05, 2009

        3 - david

        whine

        good compromise from 4.10s but have a tendency to whine.

        Helpful (9)
      • September 10, 2009

        5 - Brian

        better than 4.10s imo

        Went from stock to 4.10s. that lasted about a year. Decided to go down to 3.90s. They are definatly a much more street friendly gear, but still get up and move! 3rd redlines at about 85, and 4th is around 115, so you'll definatly still have plenty of oomph to blow past the slow traffic on the freeway-

        Helpful (8)
      • October 09, 2007

        5 - Travis

        Great get up and go.

        I feel that these are the great in between gears to have. I didn\'t want 3.73\\\'s but I didn\'t want 4.10\\\'s either. You will get a great improvement when you hit the throttle.

        Helpful (10)

      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

      Will It Fit My Mustang

      • Boss 302 - 12, 13
      • Bullitt - 01, 08, 09
      • Cobra - 93, 94, 95, 96, 97, 98, 99, 00, 01, 03, 04
      • Cobra R - 93, 95, 00
      • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
      • GT500 - 07, 08, 09, 10, 11, 12
      • LX - 87, 88, 89, 90, 91, 92, 93
      • Mach 1 - 03, 04
      • Other - 86
      • V6 - 11, 12, 13, 14

      Fits Mustangs equipped with a 8.8" rear end

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