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
1jeep wrote:
I saw about 1.5 mpg loss.
I went from a 2011 f250 with 20" wheel and 3:55 gears I was averaging about 17mpg empty at 75 mph. My current 2016 f350 drw with 4:30 gears an 17" wheels is getting about 15.4 mpg empty at 67mph.
Did I need 4:30 gears to tow 16k lbs, maybe not, but there has only been one grade that has made this truck drop a gear on the highway. To me its worth it!
The bigger tire dia of the 19.5" that the 450 comes with should help bring the rpm down a tad.
Exactly the info I was looking for. Thanks for sharing.
Lakeside
