Sounds like the new bearings aren't as interchangeable as you might wish, what's the assembled width of each in comparison to the originals?. And or double check that you have both outer races fully seated in the hub.

Whatever you do don't over tighten the wheel bearing adjustment.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-