Improve Off The Line Acceleration.
From the factory the 2010-2014 V8 powered Mustangs came equipped with either 3.31, 3.55 or 3.73 gears, all of which are good choices for daily drivers who are looking for good performance and fuel economy. However if your a spirited driver who is looking for an increase in torque and quick jack rabbit like starts a set of Richmond Excel 3.90 Ring and Pinion Gears may be a better choice. By upgrading to a set of steeper ratio 3.90 Excel Gears your Mustang will enter into its power band much sooner which will help to improve low end torque and give you the rapid off the line acceleration you're craving.Superior Quality.
Richmond proudly manufactures their Ring and Pinion Gear Sets right here in the USA. Using state-of-the-art manufacturing processes and extensive quality control testing, Richmond produces a superior quality Ring and Pinion Gear Set at an excellent price. Richmond is so confident in the quality of their products that they back them with a 6 month, 50,000 mile no-nonsense warranty.Required Upgrade.
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. Recommended Upgrade.
Please note that when changing the gear ratio of your Mustangs rear differential that the calibration of your speedometer will no longer be correct and will display the wrong speed. However, you can easily fix this annoying issue with a Handheld Tuner
This 3.90 ratio Richmond Excel Ring and Pinion Gear set will fit all 2010 to 2014 V8 Mustangs equipped with an 8.8" solid axle rear end, including the GT, BOSS and Shelby GT500 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.
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