155 ft lbs.
288lb/ft to 334lb/ft
the truck has hubs. 4x4 front wheel bearings are not serviceable.
Wheel bearing hubs on all vehicles has to be at least 200 foot pounds. This should be in the directions when you purchase the wheel hub
If 4-wheel drive is not needed, you should unlock the front hubs. Yes, the hubs remain locked even if your front transfer case is not set to 4-wheel drive, and this can be very hard on both the hubs and transfer case.
A diagram of the Ford F1 50 front hubs can be obtained from most Ford dealerships. The front hub diagram can be found at most auto-parts stores.
The hubs lock the axel to the hub, which drives the wheel. With the transfer case in 2WD, the rear driveshaft drives the rear wheels. Without front hubs, in 2WD, as the front tires roll, they spin the axles and the front driveshaft. With lock out hubs, in 2WD and the hubs unlocked only the tires spin. However, in 4WD if you forget to lock the hubs, only the driveshafts and axles spin. When I lived in MI, in the winter I always kept my hubs "locked", this way I could shift into 4WD whenever I needed to without getting out in the cold to "lock" the hubs.
I have a 2005 which does have locking hubs, but that is so you can lock your differential from slipping. If you're stuck on a hill with all 4 wheels spinning, lock the hubs and your gear ratio is far apart, your front wheels won't spin, and the front wheels will actually do the pulling. Whether yours has locking hubs depends on the year of F250. Later F250's, I believe beginning with the 1998 models, do have auto-locking / manual hubs. The later F250 hubs can be activated manually or electronically. When you electronically turn on the 4wd ("shift-on-the-fly"), you engage the transfer case, front drive shaft, and front axle shafts. Also, when you electronically turn on the 4wd you activate a vacuum solenoid, which provides a vacuum source to each of your front hubs to engage them. The front hubs only connect the front wheels to the front axle shafts and has nothing to do with the front axle differential, which is an open differential unless you have a differential other than the factory installed piece.
4x4 hubs will have oil.2 wheel drive will have grease
Engages automatic locking hubs on for wheels drives with automatic hubs.