Excel by Richmond 3.73 Gears (05-10 GT)

Excel by Richmond 3.73 Gears (05-10 GT)
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About Richmond

Richmond Mustang Performance Gears
Richmond Gear is the leading manufacturer of professional quality, hi-performance ring and pinion sets and transmissions. For over 80 years, the DOUBLE DIAMOND has signified ...... READ MORE
OUR PRICE$159.99
Market Price $179.99You Save 11% ($20.00)
Item # 21526G05

Accessories Options

Add Gear Install Kit

Accessories Options

Add Traction-LOK Rebuild Kit w/ Carbon Discs

Accessories Options

Add 2010 8.8in Rear Gear Pinion Bearing
PRICE WITH OPTIONS $159.99
AmericanMuscle no longer carries the Excel by Richmond 3.73 Gears (05-10 GT). Please check out 05-09 Mustang Gears for an updated selection.

Product Features

  • Better than OEM quality
  • 3.73 Gear Ratio
  • 8.8" Ring Gear Diameter
  • Fits 2005-2010 GT, Bullitt and GT500 Mustangs
  • Made in the USA
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 3.73 Ring and Pinion Gear set will fit all 2005 to 2010 V8 Mustangs including the GT, Bullitt and GT500 models. 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.

Approximate RPM for 2005-2010 GT Manual
Gear Speed
25 MPH 35 MPH 45 MPH 55 MPH 65 MPH 75 MPH
1 3888 5443 6998      
2 2301 3221 4141 5061 5981 6902
3 1518 2126 2733 3340 3948 4555
4 1150 1610 2070 2531 2991 3451
5 782 1095 1408 1721 2034 2347


Approximate RPM for 2005-2010 GT Automatic
Gear Speed
25 MPH 35 MPH 45 MPH 55 MPH 65 MPH 75 MPH
1 3704 5185 6667      
2 2634 3688 4741 5795 6849  
3 1771 2480 3189 3897 4606 5314
4 1150 1610 2070 2531 2991 3451
5 817 1143 1470 1797 2123 2450

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 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:
  • GT 05, 06, 07, 08, 09, 10
  • GT500 07, 08, 09, 10
  • Bullitt 08, 09

Customer Reviews