Ford 2022 Super Duty
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^^^^ You’re right but .... Pulling a 16000 lb RV down the highway at 65 mph takes about 150 hp. If you hit a 3% hill the power required will increase to about 285 hp.
At 65 mph with 34 inch tires and 3.31 gears the driveshaft is turning 2127 rpm.
So:
On level ground towing down the highway with 3.31 gears the torque on the driveshaft would be about 370 lb ft .... 4.30 gears would make that 285 lbft.
climbing a 3% grade at highway speed will put about 704 lbft of torque on the driveshaft with 3.31 gears or 542 lbft with 4.30 gears.
Mashing your foot to the floor in third gear at 1600 engine rpm will put 2200 lbft to the driveshaft regardless of your final drive ratio.
Or having a loaded equipment trailer sink into the ground to the point you need to be pulled can give the Powerstroke opportunity to put well over 5000 lbft of torque through the driveshaft and again it makes no difference whether you have 4.30 gears or 3.31 when you’re stuck. So bottom line is that the drive line needs to be designed to handle some serious torque but pulling an RV down the highway is pretty light work even with 3.31 gears.
At 65 mph with 34 inch tires and 3.31 gears the driveshaft is turning 2127 rpm.
So:
On level ground towing down the highway with 3.31 gears the torque on the driveshaft would be about 370 lb ft .... 4.30 gears would make that 285 lbft.
climbing a 3% grade at highway speed will put about 704 lbft of torque on the driveshaft with 3.31 gears or 542 lbft with 4.30 gears.
Mashing your foot to the floor in third gear at 1600 engine rpm will put 2200 lbft to the driveshaft regardless of your final drive ratio.
Or having a loaded equipment trailer sink into the ground to the point you need to be pulled can give the Powerstroke opportunity to put well over 5000 lbft of torque through the driveshaft and again it makes no difference whether you have 4.30 gears or 3.31 when you’re stuck. So bottom line is that the drive line needs to be designed to handle some serious torque but pulling an RV down the highway is pretty light work even with 3.31 gears.
