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Gear Ratio Calculator

Select your Transmission, Transfer Case, Crawl Box, Final Drive Ratio and Tire Diameter from the 5 tables on the left.  The two tables on the right will fill in with your vehicles gear information automatically.
Please email me with any problems or suggestions for this page.
Take a look at my other calculators

Transmission defined
AX-5 AX-15 NP435 NV3550 Other
NV4500 SM420 SM465 SR-4
T-4 T-5 T-14 T-15
T-18 T-18A T-86 T-150
T-176 32RH 42RLE AW4
Transfer Case defined
NP231 (std) NP231 (4:1) Other
Dana 18 (2.46:1) Dana 20 (2.02:1)
Dana 300 (std) Dana 300 (4:1)
Atlas II (3.8:1) Atlas II (4.3:1)
Atlas II (5.0:1)  
Crawl Box defined
None 3.5:1 4.0:1 Other
Final Drive Ratio defined
3.08 3.31 3.73 4.10
4.56 4.88 5.13 Other
Tire Diameter defined
30 31 32 Other
33 35 36
Gear Setup Summary
Your transmission's lowest gear ratio is : 1
Your transmission's highest gear ratio is : 1
Your transmission's reverse gear ratio is : 1
Your transfer case's gear reduction ratio is : 1
Your crawl box's gear reduction ratio is : 1
Your final drive ratio is : 1
Your tire diameter is in

 

Calculation Results
Forward Crawl Ratio: to 1
Forward Movement @ RPM: Feet per second
Reverse Crawl Ratio: to 1
Reverse Movement @ RPM: Feet per second
Highway Speed @ RPM: MPH

Why should you care about all of this "Gear Ratio" stuff?