re bearing:
a few things;
1. when replacing, make SURE the axle nut is tightend to 208-214 FT/lbs of torque!!
2. Look in to making sure that one of your failed bearings hadn't spun inside the hub, making the hub slightly larger ID (from eating away at it while spinning) causing premature failure.
3. do it yourself
hub WITH bearing already pressed in it (simple swap, now!) is 165 shipped, from Tousley ford.. or ~$60.00 for a bearing, and labor to press it, if your hub isn't bad...
Ray