How often do you have them repacked? I’m under the impression that they should be good for 50-60k miles under normal conditions (I’ve let mine go longer). If this is your third time, then you must be racking up the miles. As far as procedure – it is fairly self-explanatory. Remove wheel, drum (if drum brake), dust shield, cotter pin (don’t reuse), nut & washer. Pull rotor off, remove front-side bearing. Pry seal from back-side and pull out back-side bearing. Next bang out bearing races. Clean off all grease, now bang in new races. Pack new bearings with grease. Insert the back-side one and install new seal – put rotor back on spindle, insert front-side bearing, then washer. Tighten down nut then back off ½ turn (this seats everything) – then tighten lightly against the washer. Insert new cotter pin and so on. This is the just of the process – it isn’t by any means professional instructions. I’ve done my truck once along with a couple of trailers. It is a messy job

If I were you, I would pick up a Haynes auto manual for your truck and use their steps(w/ photos

) and techniques for banging out the seals, greasing the bearings, and torque settings. - HTH