There is a switch on the transfur case that sends power to the front differential 4x4 Actuator when you shift the 4x4 lever,need to check the switch with a test light to see if it has power going to it. If not then check fuse in fuse box for the 4x4, If it does have power going to it, then go to the front housing and check the Actuator with a test light to see if it has power going to it, if no power then problem is in the wireing from there back to the transfur case switch. If you do have power at the front, then replace the Actuator.
maybe
near the front differential
There is no differential. The transmission is both a transmission and front wheel drive trans axle. It is all in one.
no
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.
Replace them.
Looking at the front suspension, look for axle stubs with rubber boots extending from the front differential to the front hub assembly (just inside the front tires) The presence of both the axle stubs and the front differential signify AWD/4WD
Yes
4x8 in the front and 6x9 in the rear
The fuel gauge fuse on 1998 Chevy blazer is located in the front of the blazer. It is on the driver side next to the hook latch.
It is on the front of the motor, it will be the bottom most pully.
In front of and behind the catalytic converter.