Join Date: Aug 2007
Location: Colorado Springs, CO
Re: Has anyone switched from 4.10's to 3.73 gears--how difficuilt
I went from 3.73 to 4.10 a few years ago. As the others stated, this does not involve your transfer case. I added a rear locker since I had to replace the rear carrier anyway (damaged), but I think you have to replace the carrier anyway when making this change. If you decide to change gears, find a good shop, if it is not set up correctly you will regret it.
The tire option is a good alternative. I would have to think about it for a bit to give you the formula, but 285/75R16s with 4.10s are very close to 3.73s with stock size tires. If you are truly looking for optimal economy, larger tires and a higher truck will impact mileage to some degree.
99.5 F250, CC, LB, 4WD, 6SPD, 4.10
Those who tolerate everything, stand for nothing!