USA Standard 3.90 Gears (05-09 GT)

USA Standard 3.90 Gears (05-09 GT)
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About USA Standard

Yukon Gears and Axles
Yukon Gear and Axle build quality parts that exceed expectation, it’s that simple! Yukons in-house engineering team utilizes state-of-the-art computer software to design expectational products that are manufactured in partnership with some of the world’s foremost leaders in OEM manufacturing. Only after rigorous testing and intense quality control inspection can it earn the name Yukon.
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OUR PRICE$149.99
Market Price $169.99You Save 12% ($20.00)
Item # 21615G05
(4.5/5)2 Reviews
Add Gear Install Kit
Add Traction-LOK Rebuild Kit w/ Carbon Discs
Add 2010 8.8in Rear Gear Pinion Bearing
PRICE WITH OPTIONS $149.99
AmericanMuscle no longer carries the USA Standard 3.90 Gears (05-09 GT). Please check out 05-09 Mustang Gears for an updated selection.
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Product Features

  • USA Standard Gear
  • Manufactured from 8620 gear steel
  • 3.90 gear ratio
  • 8.8" ring gear diameter
  • Fits 2005-2009 GT, Bullitt, and Shelby GT500 Mustangs
Wake Up Your Pony. Installing a set of steeper gears is a great way to get your Mustang into the power band quicker for improved low end torque and faster acceleration off the line. A set of USA Standard Gears will really wake up your Pony.

Better Than OEM Quality. Using state-of-of-the-art equipment and manufacturing techniques USA Standard Ring & Pinion sets are made to higher than OEM standards from high grade 8620 gear steel and are backed by a one year warranty.

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 USA Standard Gear 3.90 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.

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.

Approximate RPM for 2005-2010 GT


Manual
Gear @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


Automatic
Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
1 3873 5422 6971      
2 2754 3856 4957 6059    
3 1852 2593 3334 4075 4816 5556
4 1203 1684 2165 2646 3127 3608
5 854 1195 1537 1879 2220 2562

Installation Time:

(approx) 4 Hours

Difficulty Level:

Mechanical expertise or professional installation required.

What's in the box?

  • (1) Ring gear
  • (1) Pinion gear

Installation Guides:

What's in the box?

  • (1) Ring gear
  • (1) Pinion gear
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Fitment:
  • GT 05, 06, 07, 08, 09
  • GT500 07, 08, 09
  • Bullitt 08, 09

Customer Reviews