Hmmm, those symptoms really really sound like wheel bearings. Did you do the inner and the outer bearings? I also thought our bearings were not really repackable? When I went to the Isuzu stealership a long time ago, they said they should be be replaced, not repacked.
I second the recommendation for checking the CV joint, but if the boot isn't ripped, it should be fine.
Just for giggles, you can also check two more things:
1.Check the front diff gear oil level
2.Remove the ABS fuse and see if the problem clears.