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:
Depends on the tire size and transmission ratios.
Generally it should pull a lot stronger and accelerate better at the possible expense of some fuel.
Generally ignore answer #2 and see answer #1. ;)
You have to know what the overall drive ratio IS at whatever speed you are interested in and it ALL comes into play......including tire size.
