Free Shipping On Orders Over $49. Details

Talk to a Mustang Expert
Every day 8:30AM EST - 11:00PM EST
Win Any Wheel & Tire Package! Enter Daily

EXCEL from Richmond Ring Gear and Pinion Kit - 3.73 Gears (05-09 GT, GT500)

Market Price $186.99 You Save 12% ($22.04)
Our Price


FREE Shipping

  • Item 21526G05
  • MPN# F88373

Will this fit your Vehicle?

In Stock Ships same business day.
Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    Features & Details

    • Superior Quality
    • 3.73:1 Gear Ratio
    • 8.8" Ring Gear Diameter
    • For Street or Track Use
    • Made in the USA
    • Fits 2005-2009 GT, Bullitt and Shelby GT500 Mustangs
    Improve Off The Line Acceleration. Does the idea of quicker acceleration and an increase in torque make your heart race? If so, you may want to consider upgrading your S197 Mustang to a set of Richmond Excel 3.73 Ring and Pinion Gears. Most 2005-2009 V8 Mustangs came factory equipped with 3.31 or 3.55 gears, which are ideal for the daily commuter who is concerned about fuel economy, but not for you the hard driving performance enthusiast. Installing a set of steeper gears in your Pony will place you in the power band quicker, this in turn will improve low end torque for faster off the line acceleration.

    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.

    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 Ford Racing Speedometer Recalibration Tool (sold separately).

    Application. This 3.73 ratio Richmond Excel Ring and Pinion Gear set will fit all 2005 to 2009 V8 Mustangs equipped with an 8.8" solid axle rear end, including the GT, Bullitt 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.

    Fitment: 2005 2006 2007 2008 2009 Details

    CA Residents: Warning: California's Proposition 65

    What's in the Box
    • (1) Ring gear
    • (1) Pinion gear
    Installation Info
    Tech Specs

    Approximate RPM for 2005-2009 GT

    Gear @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

    Gear @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
    Will it fit my Mustang?

    You Might Also Like

    Customer Photos

    Q & A

    No questions about this product yet.

    Ask the First Question

    Customer Reviews (4) Write a Review

    Overall Rating 3.8

    out of 5 stars

    • 4/5

      June 30, 2010

      rear end rebuild


      Clayton Hopkins

      Helpful (2)

    • 1/5

      April 13, 2010

      Not Happy At All

      Had these gears installed in my 08 Mustang Gt. Had them removed after one week. Couldn't stand the noise. Had ford Racing gears installed.


      Helpful (3)

    • 5/5

      February 20, 2010


      Great gear,Great price.just great...if jesus and moses says its great, then you know it is. ^^^^


      Helpful (3)

    • 5/5

      January 02, 2010


      awesome! just simply awesome, from the price to the performance


      Helpful (3)

    Related Mustang Categories