Quote:
Originally Posted by The_Breeze
I have no idea why they would consider a 4:56 on a cutaway chassis unless the rig is constantly crawling through high mountain passes. 4:11 seems a little bit much too. Wouldn't 3:73 suffice with a lower tranny gear you could employ?
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That’s a good question. Specifications I’ve seen so far show the new 7.3L V8 in a SuperDuty can have higher GCWR than required for a small Class B+ or Class C even when equipped with 3.73 gears, so I’d guess it might work OK. On the other hand taller and taller gearing has diminishing returns on improving fuel economy, so going from 4.56 to 4.10 should make greater difference than from 4.10 to 3.73.
For smaller aerodynamic Class B+, this engine may just be too large for optimum fuel economy. I’d like to see a small B+ that can deliver 12 MPG consistently (on average), but I’m not sure whether this 7.3L can do it. We’ll see before long.