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USA Standard 3.90 Gears (94-98 GT)

AmericanMuscle no longer carries the USA Standard 3.90 Gears (94-98 GT). Please check out 1994-1998 Mustang Gears for an updated selection.
2 Reviews
Our Price

$149.99

  • Item #21615G94
  • Market Price $169.99
  • You Save 12% ($20.00)
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AmericanMuscle no longer carries the USA Standard 3.90 Gears (94-98 GT). Please check out 1994-1998 Mustang Gears for an updated selection.

Features
  • USA Standard Gear
  • Manufactured from 8620 gear steel
  • 3.90 gear ratio
  • 8.8" ring gear diameter
  • Fits 1994-1998 GT and SVT Cobra Mustangs
Description
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 new Speedometer Gear is an inexpensive way to fix this issue.

Application. This USA Standard Gear 3.90 Ring and Pinion Gear set will fit all 1994 to 1998 V8 Mustangs including the GT and Cobra 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.

Mustang Fitment: 1994 1995 1996 1997 1998 Details

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

Approximate RPM for 1994-1995 GT


Manual
Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
1 4053 5674        
2 2393 3351 4308 5265 6223  
3 1600 2239 2879 3519 4159 4799
4 1203 1684 2165 2646 3127 3608
5 806 1128 1450 1773 2095 2417


Automatic
Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
1 2886 4041 5196 6350    
2 1764 2470 3175 3881 4586 5292
3 1203 1684 2165 2646 3127 3608
4 802 1123 1443 1764 2085 2405


Approximate RPM for 1996-1998 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 3416 4782 6148      
2 1864 2610 3355 4101 4847 5592
3 1203 1684 2165 2646 3127 3608
4 842 1179 1515 1852 2189 2526
Fitment
  • Cobra - 94, 95, 96, 97, 98
  • GT - 94, 95, 96, 97, 98

Most Helpful Reviews View All

Overall Rating 5/5 Write a Review
5/5
real wake up call !!!

was running a 3.55 gear,,put this 3.90 in and what a big change,,really has great pull in all gears woke my 306 up big time and it still good on the hwy too ,,good street gear!!!

Helpful (0) (0)

5/5

Top 100 Contributor

3:90 Gears

These are a great go between. They keep my car in the power band and at 65mph has great drivability.

Helpful (0) (0)

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Reviews (2) Write a Review

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5.0

out of 5 stars

2 Customers Recommend this Product

Installation Time:Shop Install

Installation Cost:$100-$250

  • Performance Gain: 5 5/5
  • Fit: 5 5/5
  • Bang For Your Buck: 5 5/5
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  • 5/5

    3:90 Gears

    April 22, 2013

    These are a great go between. They keep my car in the power band and at 65mph has great drivability.

    miami01

    Year: 1997 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 10+ FL

    Helpful (0) (0)

  • 5/5

    real wake up call !!!

    October 03, 2012

    was running a 3.55 gear,,put this 3.90 in and what a big change,,really has great pull in all gears woke my 306 up big time and it still good on the hwy too ,,good street gear!!!

    kholman

    Year: 1994 Model: GT Driving Style: Show 'Stangs I have owned: 2 louisville,ky

    Helpful (0) (0)

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