4.10 rear in new Ford F350
A lot of leftovers have the 4.10 rear any one know if there would be a big difference in MPG towing or would it be negligible..?
Forum Discussion
Huntindog wrote:4x4ord wrote:Ummm. Fords max specs need the 4.10s. OP doesn't state what he will be towing. Just that he will have a 5500# camper, AND towing something occasionally.. He may be pushing that truck pretty hard.
The differeonce in 60mph high gear cruising rpm between 3.55 and 4.10 is 1524 rpm vs 1760 rpm. The power required to tow a 16k 5ver at 60 mph on level ground is only about 100 hp. The 6.7 can produce 320 hp at 1800 rpm. When peak hp is needed in the hills the 4.10 rear gears will have the transmission in 5th and the engine running 2260 rpm at 60 mph. The 3.55 gears would put the transmission in 4th gear with the engine running 2616 rpm. So the 3.55 gears are going to out pull the 4.10 gears on hills that the truck is capable of climbing at 60 mph. It takes a pretty steep hill or a very heavy trailer before the 4.10 gears offer the advantage.
Yep Exactly! The 4.10's are the way to go. It'll walk right past a similarly loaded 3.73 truck.
