I need to replace a Front wheel bearing on my 98 ford ranger.

Remove the wheel and take off your brake caliper. Once you have the wheel off, you will see a dust cap in the center of the wheel. Remove the dust cap by using a pair of channel locks, don't use something to pry it loose as this will cause it to leak grease later. Once you have the dust cap off you will see inside a castle nut held in place with a cotter pin. Remove the pin and unscrew the nut. This will allow the rotor and bearing to come out. Replace the bearing with the new one using a high temp grease to grease them.... IMPORTANT: when you grease the new bearings make sure to grease them thoroughly. Put a glob of grease in the palm of your hand and slowly dab the sides of the new bearings in the grease (this will allow the bearings to be greased on the inside).... Put back together as you found it. NOTE: When tightening the castle nut, tighten it down tight and then release it a quarter turn back before before inserting the pin to hold it back in place. Good luck! Let me know how it goes.  PS If when you have the rotor off, you have trouble getting the inside bearing off try this very simple and useful trick: Put the rotor back on the spindle and thread the castle nut on a couple of times. Next **** the rotor across the nut. This will cause the bearing to hang up on the castle nut and simply pop out.