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.
| Approximate RPM for 1999-2004 GT Manual | |||||||||
| Gear | Speed | ||||||||
| 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 | |||
| Approximate RPM for 1999-2004 GT Automatic | |||||||||
| Gear | Speed | ||||||||
| 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 | |||
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 >>
