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Richmond Performance 3.90 Gears (86-14 V8; 11-14 V6)

AmericanMuscle no longer carries the Richmond Performance 3.90 Gears (86-14 V8; 11-14 V6). Please check out Ford Mustang Gears & Rear End Components for an updated selection.
4 Reviews
Our Price

$159.99

  • Item #21527
  • Market Price $179.99
  • You Save 11% ($20.00)
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AmericanMuscle no longer carries the Richmond Performance 3.90 Gears (86-14 V8; 11-14 V6). Please check out Ford Mustang Gears & Rear End Components for an updated selection.

Features
  • Better than OEM quality
  • 3.90 Gear Ratio
  • 8.8" Ring Gear Diameter
  • Fits 1986-2014 V8 and 2011-2014 V6 (excludes 2013-2014 GT500)
  • Made in the USA
Description
Improves Off The Line Bite. Are you looking to install a steeper set of gears in your Pony to get more low end grunt off the line? Then look no further than a set of Richmond gears. Richmond has been making high quality gears at a friendly price for well over 80 years.

Made in the USA. Manufactured right here in the USA, Richmond uses state-of-the-art manufacturing and extensive testing to produce a superior quality ring and pinion gear set at an excellent price.

Application. This Richmond 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, 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

Mustang 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

What's in the Box
  • (1) Ring gear
  • (1) Pinion gear
Installation Info
Fitment
  • Boss 302 - 12, 13
  • Foxbody - 86, 87, 88, 89, 90, 91, 92, 93
  • Mach 1 - 03, 04
  • V6 - 11, 12, 13, 14
  • Bullitt - 01, 08, 09
  • Cobra - 94, 95, 96, 97, 98, 99, 01, 03, 04
  • GT - 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

Fits Mustangs equipped with a 8.8" rear end

Most Helpful Reviews View All

Overall Rating 3.2/5 Write a Review
1/5
noisy

Good ratio...VERY NOISY at cruise...and yes it is set up right ..pattern was perfect......replacing with FORD Gears....also Motive Kit for 8.8 did not include any small shims....only 14's and 30's.

Helpful (12) (2)

4/5
RICHMOND 3.90 GEARS

OVER ALL GOOD PRODUCT INSTALLATION WAS GOOD SLIGHT WINE AT CRUZE SPEED GREAT GEAR RATIO FOR MY 2003 MACH1

Helpful (5) (0)

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Reviews (4) Write a Review

  • 5 Stars .25 25%
  • 4 Stars .25 25%
  • 3 Stars .25 25%
  • 2 Stars 0 0%
  • 1 Stars .25 25%
3.2

out of 5 stars

2 Customers Recommend this Product

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  • 1/5

    noisy

    January 09, 2010

    Good ratio...VERY NOISY at cruise...and yes it is set up right ..pattern was perfect......replacing with FORD Gears....also Motive Kit for 8.8 did not include any small shims....only 14's and 30's.

    chris s

    Helpful (12) (2)

  • 4/5

    RICHMOND 3.90 GEARS

    October 18, 2010

    OVER ALL GOOD PRODUCT INSTALLATION WAS GOOD SLIGHT WINE AT CRUZE SPEED GREAT GEAR RATIO FOR MY 2003 MACH1

    BRYAN ISBELL

    Year: 2003 Model: Mach 1 Driving Style: Daily Driver

    Helpful (5) (0)

  • 3/5

    Richmond Gears 3.90

    October 14, 2010

    The 3.90 gears really improve your acceleration and are the cheapest way to go faster without sacrificing too much fuel mileage/drivability. I was impressed by the quickness in which my order was received to my front door. However, after installing my 3.90 gears (making sure that both the pinion depth and backlash were correct) I noticed a whine. The whine did not subside after the break in period. I contacted AM who was very helpful and was instructed to speak with Richmond. Richmond did not really do anything to help me and hopefully the gears hold up. So far noise is the only problem. If I could do it again I would purchase Ford Racing gears.

    Bill Henry

    Year: 1990 Driving Style: Daily Driver

    Helpful (5) (1)

  • 5/5

    HUGE improvement!

    December 11, 2010

    Bought this as part of a complete rear-end rebuild on a 1995 GT. These gears make a HUGE difference over the stock 2.73 gears. You it makes the car take off so much faster. Good compromise between 3.73 and 4.10's. With an Auto trans the car cruises at between 2800-3000 RPMs going 60-70mph. Only lost about 2-3mpg as well. Only complaint about this is I can't find a speedometer gear for 3.90 gears anywhere. I see other people are mentioning a gear noise but I don't hear it...course my 'stang is rather loud...

    Steel_Venom

    Year: 1995 Model: GT Driving Style: Daily Driver

    Helpful (3) (0)

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