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Richmond Excel by 3.90 Gears (99-04 GT)

AmericanMuscle no longer carries the Richmond Excel by 3.90 Gears (99-04 GT). Please check out 1999-2004 Mustang Gears for an updated selection.
3 Reviews
Our Price

$159.99

  • Item #21527G99
  • Market Price $179.99
  • You Save 11% ($20.00)
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AmericanMuscle no longer carries the Richmond Excel by 3.90 Gears (99-04 GT). Please check out 1999-2004 Mustang Gears for an updated selection.

Features
  • Better than OEM quality
  • 3.90 Gear Ratio
  • 8.8" Ring Gear Diameter
  • Fits 1999-2004 GT, Bullitt, Mach 1 and Cobra Mustangs
  • 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.

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 Richmond 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.

Mustang Fitment: 1999 2000 2001 2002 2003 2004 Details

Installation Info
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
Fitment
  • Bullitt - 01
  • Mach 1 - 03, 04
  • Cobra - 99, 01, 03, 04
  • GT - 99, 00, 01, 02, 03, 04

Most Helpful Reviews View All

Overall Rating 2.7/5 Write a Review
3/5
Richmond Gears 3.90

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

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Helpful (2) (0)

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 (1) (0)

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Reviews (3) Write a Review

  • 5 Stars 0 0%
  • 4 Stars .33 34%
  • 3 Stars .33 33%
  • 2 Stars 0 0%
  • 1 Stars .33 33%
2.7

out of 5 stars

1 Customer Recommends this Product

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  • 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

    Driving Style: Daily Driver

    Helpful (2) (0)

  • 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 (1) (0)

  • 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 (0) (0)

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