NYJeepin.com

NYJeepin' Ratio Calculator

created by Mark Medina
at www.4Lo.com

Transmission ratio (first gear)
Transfer case ratio (low-range)
Axle Ratio

Crawl Ratio

Overall Crawl Ratio
Use this calculator to determine your overall low-gear crawl ratio. Input the numbers of your lowest possible tranny and transfer case gears (ie, the first gear ratio of the tranny and the low-range reduction of your transfer case). The higher the number, the better!

Original tire diameter (in.)
New tire diameter (in.)
Speedo reading (mph)

Corrected Speed

Speedo Converter
Most of us have had the problem of an inaccurate speedo after changing our tire size. Use this calculator to find your actual speed. If you have metric-sized tires, use the calculator below to find its diameter in inches.

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Tire Diameter

Tire Size Converter
Use this to convert your metric size tire to standard size (in inches of diameter).

RPM
Tire Diameter
Axle Ratio
Transmission Ratio (high gear)
Transfer Case Ratio (high range)

Speed (MPH)

Find MPH
Here is another way to find your actual speed. Use this if you don't know the original tire size of your Jeep or your speedometer doesn't work. You'll need a tach for this one. Generally, the high range for the transfer case is "1".

MPH
Axle Ratio
Transmission Ratio
Transfer Case Ratio
Tire Diameter (in.)

RPMs

RPM Calculator
If you don't have a tach, use this calculator to figure out your motor's RPMs at any given speed.

New tire diameter (in.)
Old tire diameter (in.)
Current Gear Ratio

Ratio Needed

Gearing Equivalent
This calculator will determine the new axle gearing that you will need if you want to retain the same performance with different size tires.