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Richmond 8.8 in. 3.55 Gears (05-09 GT)

Market Price $258.51 You Save 9% ($23.50)
Our Price

$235.01

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  • Item 66502G05
  • MPN# 66502G05

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Features & Details

  • Exceptional Quality
  • Handle Extreme Torque Applications
  • First-Run, Never Recycled Materials
  • 3.55 Gear Ratio
  • 8.8" Ring Gear Diameter
  • 2-Year / 100,000 Mile Warranty
  • Fits 2005-2009 GT Mustangs
Get Going. One primary reason you purchased a sports car instead of an SUV or pickup is because you want to have fun while driving. Get into the power band faster in your 2005-2009 GT Mustang by upgrading your rear end gears to a set of 3.55s. Enhance your acceleration and fun with a set of Richmond Gears for your Pony.

Superior Quality. Manufactured right in the United States, Richmond Gear uses only the highest standards to produce the highest quality gears in the industry. Inspected and scrutinized to deliver gears with acceptable tolerances, durability and fit, Richmond ensures only the best in machining, finishing and heat treating of their drivetrain components.

Recommended Upgrade. When changing the gear ratio of your Mustang's rear differential, the calibration of your speedometer will no longer be accurate and will display the wrong speed. However, you can easily fix this annoying issue with a Tuner or Recalibration Tool (sold separately).

Installation Notes. An Installation and Bearing Kit is highly recommended by most installers, especially on high mileage Mustangs. Please see ordering options above.

Warranty. Richmond Gears is so confident in the high quality of their ring and pinions that they are backed by a 2-Year / 100,000 Mile No-Nonsense Warranty.

Application. These Richmond 3.55 Ring and Pinion Gears will fit all 2005 to 2009 GT Mustangs equipped with an 8.8" rear end.

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 your gears are installed. See ordering options above.

Fitment: 2005 2006 2007 2008 2009 Details

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

Approximate RPM for 2005-2009 GT


Manual
Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
1 3700 5180 6660      
2 2190 3065 3941 4817 5693 6569
3 1445 2023 2601 3179 3757 4335
4 1095 1533 1971 2408 2846 3284
5 744 1042 1340 1638 1936 2233


Automatic
Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
1 3525 4935 6345      
2 2507 3510 4513 5515 6518  
3 1686 2360 3035 3709 4383 5058
4 1095 1533 1971 2408 2846 3284
5 777 1088 1399 1710 2021 2332
Will it fit my Mustang?
  • GT - 05, 06, 07, 08, 09

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Customer Reviews (1) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Shop Install

  • Performance Gain 5 5
  • Fit 5 5



  • 5/5

    Installation Time: Shop Install

    January 24, 2017

    Just what I wanted

    My car would hesitate on take off and these gears makes me feel like I have a whole new car, no more hesitation on take off!!

    Mustanggirl

    Year: 2009 Submodel: GT

    Helpful (1)

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