calculators
First, this calculator is complex and doesn't work well, if at all, on a phone. You really should use a tablet or larger computer.
Second, this calculator let's you do what-if scenarios using different tire sizes, axle ratios, transfer cases, and even the torque converter slippage on a C4 or C6.
Essentially there are two calculators - one to show you the engine RPM at your target MPH, and one to show you the vehicle MPH at a target engine RPM. To use them enter your info into the Parameters table that will pop up on the rights side and either hit Enter or scroll to the bottom and hit Apply. You'll see those numbers go into the blue Input cells and see the results in the green cells.
Note that "slippage" is for the loss through the torque converter on a C4 or C6 automatic. And "OD" is the overdrive ratio of whatever OD unit you might be considering, but the .78:1 # that is in there is for a Gear Vendors unit.
And the transmission gear ratios shown are from the page on Transmission & Transfer Case Gear Ratios. The information there comes from Ford's yearly Facts Books that supplied the dealerships with all the latest information on these trucks.
Last, I can't get the dropdown to work yet where you are to choose which transfer case you are using. Sorry, I'm still working on that. So until I do get it sorted go to the bottom and pick the proper Low Range Gear Ratio for your transfer case and type that in for the OtherTcase parameter.
(NB: File is Driveline Calculator - with Excel Options.xls)
Second, this calculator let's you do what-if scenarios using different tire sizes, axle ratios, transfer cases, and even the torque converter slippage on a C4 or C6.
Essentially there are two calculators - one to show you the engine RPM at your target MPH, and one to show you the vehicle MPH at a target engine RPM. To use them enter your info into the Parameters table that will pop up on the rights side and either hit Enter or scroll to the bottom and hit Apply. You'll see those numbers go into the blue Input cells and see the results in the green cells.
Note that "slippage" is for the loss through the torque converter on a C4 or C6 automatic. And "OD" is the overdrive ratio of whatever OD unit you might be considering, but the .78:1 # that is in there is for a Gear Vendors unit.
And the transmission gear ratios shown are from the page on Transmission & Transfer Case Gear Ratios. The information there comes from Ford's yearly Facts Books that supplied the dealerships with all the latest information on these trucks.
Last, I can't get the dropdown to work yet where you are to choose which transfer case you are using. Sorry, I'm still working on that. So until I do get it sorted go to the bottom and pick the proper Low Range Gear Ratio for your transfer case and type that in for the OtherTcase parameter.
(NB: File is Driveline Calculator - with Excel Options.xls)