There are two copies of the form so that you can do a side-by-side comparison of two combinations.
Step 1: Select transmission from the drop down list or, if it's not in the list and you know the gear ratios of your transmission, enter them below.
Number of forward gears 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear Reverse Manual or Auto with lockup torque converter Automatic without lockup toque converter
Step 2: Select transfer case from the drop down list or, if it's not in the list and you know the gear ratios of your transfer case, enter them below.
High Range Low Range STaK 3rd Range
Step 3: Select underdrive.
High Range Low Range
Step 4: Select axle gear ratio. Ratio
Step 5: Select tire size.
Inch Metric 125 135 145 155 165 175 185 195 205 215 225 235 245 255 265 275 285 295 305 315 325 335 345 355 365 375 385 395 / 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 R 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Step 6: Hit the calculate button and read the results below.
If you want to clear the results and try again, hit this button
The following chart lists the final drive ratio of all combined gears (transmission, transfer case, underdrive, axle) in all possible combinations
The following chart lists the crawl speed you will be going while the engine is at a given RPM. Crawl speed is calculated based on the lowest low range (transfer case and underdrive in low range) available in your rig.
The following chart lists the road speed you will be going while the engine is at a given RPM. Road speed is calculated based on the transfer case and underdrive being in high range.
The following chart lists the RPMs your engine will be turning while driving at a given speed on the road.
Step 4: Select axle gear ratio. Ra tio