Motive Performance Plus 3.90 Gears (86-12 V8; 11-12 V6)

Motive Performance Plus 3.90 Gears (86-12 V8; 11-12 V6)

About Motive Gears

Motive Gears
Celebrating Their 65th year of serving the Automotive Aftermarket, no one is more committed to providing the highest quality part available today than Motive Gears. ...... READ MORE
OUR PRICE$229.99
Market Price $239.99You Save 4% ($10.00)
Item # 21102
Ships the same business day

Accessories Options

Add Gear Install Kit

Accessories Options

Add Traction-LOK Rebuild Kit w/ Carbon Discs

Accessories Options

Add 8.8in Rear Gear Pinion Bearing

Accessories Options

Add Ford Racing Speedcal
PRICE WITH OPTIONS $229.99

Product Features

  • CNC-cut from 8620 gear steel
  • For street or track use
  • Superior quality
  • 3.90 Gear Ratio
  • 8.8" Ring Gear Diameter
  • Fits 1986-2012 V8 and 2011-2012 V6

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 2012 V8 Mustangs including GT, Bullitt, Mach 1, Cobra and the 2012 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

Installation Time:

(approx) 4 Hours

Difficulty Level:

Mechanical expertise or professional installation required.

Customer Submitted Installation Guides:

Differential Gears - Installation Instructions
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Fitment:
  • V6 11, 12
  • GT 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12
  • Cobra 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04
  • Mach 1 03, 04
  • GT500 07, 08, 09, 10, 11, 12
  • Bullitt 01, 08, 09
  • Foxbody 86, 87, 88, 89, 90, 91, 92, 93
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Known Exceptions:
Fits Mustangs equipped with a 8.8" rear end.

Customer Reviews

4.36
  • 3/5
    whine
    December 5, 2009
    david
    good compromise from 4.10s but have a tendency to whine.
    2 of 2 voted this as helpful.No, I do not recommend this product.
  • 3/5
    390
    July 14, 2010
    Matt
    1990
    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
    5 of 5 voted this as helpful.No, I do not recommend this product.
  • 5/5
    perfect gear
    June 2, 2010
    chalmers
    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..
    4 of 4 voted this as helpful.Yes, I recommend this product.