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sound like you have the automatic four wheel drive system where the transfercase control module controls the 4WD system if you dont see shifter knob on console you have automatic 4WD drive system.
no special tools in particular just the usual or necessary tools required.. 1stly u remove the Tyre and the caliper then u'll see something like a long rod dats the bearing
nowadays, mechanics can change an assembly and pay only $55 to $75 or up for the whole hub assembly complete with the abs wheel speed sensor.
The assembly comes with a new bearing. Otherwise, special knowledge and tools are required to press a new bearing on to the old hub, which probably is rusty.
So, it makes sense to change the whole hub assembly when the bearing goes bad, and many times get a lifetime warranty on the part..
Before you do this you might want to try fresh gear lube. On Ford products they use a synthetic additive in the rear and not in the front 4x4 axle.
The next thing would be to determine if it is a wheel bearing or a pinion bearing. You have to pull the axles and eliminate them as the problem. You might get lucky and not need to do the pinion.
The technical part of shimming the pinion gears with replacing the pinion bearing is about the worst part of the job. You won't know about the gears until you see them. You will need extra shims on hand.
It is a moderate job for two people. If you have all the parts it can be done in a day.
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