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
Unless you are towing really heavy, or changing trailers to really heavy, the 4.30s would be overkill. The new 6.7 is a little stronger than your 2011, so if the 3.55 is working for you, no need to move to 4.30.
Towing in 5th with 3.55, would be close to towing in 6th with 4.30.
Jerry
Towing in 5th with 3.55, would be close to towing in 6th with 4.30.
Jerry
