Re: Why Gearing Works
It depends on the engine.
The 7.3 is a low-end torque monster. I have been experimenting around the 1000-1300 RPM range and I think it can be quite effective there.
One problem: Below 1300 the engine becomes naturally aspirated - no boost. Completely burning the fuel needs boost, particularly under load.
I think I'd have to go to a different turbo in order to get some boost at low RPM. Of course I'd lose boost at high RPM, but if I were at 2500 RPM with gearing suitable for 70 MPH @1200 RPM, I would be going 145 MPH and probably cruising at 10,000 feet.
At any rate if the engine lugs and rattles, downshift.
2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Rugged Air Dam