Motive Performance Plus 3.90 Gears (99-04 GT)

Motive Performance Plus 3.90 Gears (99-04 GT)
Click to Enlarge
Email
(4.4/5)
9 Reviews
(4.4/5)9 Reviews
OUR PRICE$239.99
Motive Gears
Item # 21102G99
Market Price $271.19You Save 12% ($31.20)
Ships the same business day

Product Features

  • Superior quality
  • CNC-cut from 8620 gear steel
  • 3.90 Gear Ratio
  • 8.8" Ring Gear Diameter
  • For street or track use
  • Fits 1999-2004 GT, Bullitt, Mach 1 and Cobra Mustangs

RECOMMENDED WITH THIS PRODUCT

$239.99
Add Gear Install Kit
$89.99
Add Traction-LOK Rebuild Kit w/ Carbon Discs
$102.59
Total Price: $239.99
Improve Overall Performance. A set of Motive Performance gears will wake up your Pony and get it moving faster off the line. Steeper gears are a great way to lower quarter mile times and improve responsiveness without sacrificing driveability. 3.90 gears are perfect for the Pony that needs more than 3.73s but less than 4.10s, offering a great blend of performance and efficiency.

Superior Construction & Precision Fit. These Motive ring and pinon gears are CNC cut from high grade 8620 gear steel, and factory lapped for precision fit. Each set is hardness tested prior to leaving the factory to ensure the highest quality. Unlike other brands, Motive Gears do not have a reputation for "gear whine".

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 Motive Performance Plus 3.90 Ring and Pinion Gear set will fit all 1999 to 2004 V8 Mustangs including the GT, Bullitt, Mach 1 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. 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.

Approximate RPM for 1999-2004 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

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
checkmark
Fitment:
  • GT 99, 00, 01, 02, 03, 04
  • Cobra 99, 01, 03, 04
  • Mach 1 03, 04
  • Bullitt 01

About Motive

Motive Gears
Celebrating Their 65th year of serving the Automotive Aftermarket, no one is more committed to providing the highest quality part available today than Motive Gears. Their distinct divisions provide for excellent market focus while maintaining their massive combined purchasing power to provide the best products for the highest value with the best service in the industry.

YOU MIGHT ALSO LIKE