Difference between 4.30 & 3.55 gears
My 2011 F-350 has a 3.55 geared rear end. The new 2017 F-450 only comes with a 4.30 geared rear end. Basically the same engine (6.7 turbo diesel). Does that mean better or worse fuel consumption...
Forum Discussion
KD4UPL wrote:X 2
Depends on the tire size and transmission ratios. They're likely pretty similar. Fuel consumption will be worse not towing. Towing it might be similar. It depends on how fast your going in which gear and what RPM the engine ends up in. You will turn more RPM to go the same speed.
Generally it should pull a lot stronger and accelerate better at the possible expense of some fuel.
