F250 6.2 gas Towing heavy with 3.73 rear ??

Denny & Jami wrote:

Learjet wrote:
having this discussion on another forum..

about 3:73 vs. 4:30 rear gears for the Modern Super Duty Gas engines...this is a 6 speed tranny with 5 and 6 being over-drive gears.

"But... once operating in a transmission over-drive gear,either 5 or 6, the torque is not magically produce by the 4:30 rear gears...right?

example:
3:73 gears, 5th (1st over drive from transmission) engine operating at 2200 rpm = X torque at wheels

4:30 gears, 6th (2nd over drive from transmission) engine operating at 2200 rpm = X torque at wheels.

in this case X should be equal? "

What say you?

The rear end gears are the last torque multiplier so lower gears will give you more mechanical advantage through all the gears.

Simple example you need to torque a bolt to 1000 you use a 10 to 1 multiplier so you only have to exert 100 ft lbs to get that torque. If you go to a 5 to 1 multiplier you would need 200 ft lbs to gain the same same torque.

Denny

I get that, but I think that you are reducing the torque from the engine at the drive shaft with the 2nd over-drive gear, so for the same engine speed (rpm) and the moving speed (MPH) if the over all gearing is the same as in my example, then?

I know it is not perfectly even in the Ford with the different rear gear and 5 to 6 gear...but just for discussion.