Got a link to the site you got the bearings from?I got some very good made in USA Timken bearings from 4x4offroad.com, for the rear of my F350. They have the front bearings as well. It was $325 for the kit, which included bearings, all seals, socket for the ratcheting nut, and two bearing race drivers.
Of course, then I got the rear end apart, and found that the rumbling sound I was hearing wasn't the bearings, it was corrosion on the emergency brake drum (which I hadn't used in ages), amplified by the dust plate next to the disk.
Oh well, I needed to change out the diff oil anyway. I'd send the bearing kit back, but you know that as soon as I do that, the rear bearings will fail within a week. So the kit gets packed away until I need it.