Gear calculator

[notchrocket]

I need a calculator to find the right gear for my truck since I've added larger tires. I think 4:10's would be correct but I just want to make sure.

Original gear = 3:55 Original tire size = 30.5"

NEW tire size = 33"

Any help would be appreciated.
Thanks guys.

-Dan

 

[1BADAIR]

3.85

 

[Pwraddr]

Wallace racing calculators.

 

[Detroit Gearbox]

TIRE HEIGHT (IN INCHES) times pie divided by 12 = X
5280 divided by X = Y
Y TIMES GEAR RATIO = RPM @ 60 MPH