Had the same problem. I tried replacing with a used one off of a spare rear that I have but had the same problem, the bearing did not have a tight / snug fit, luckily the aftermarket world has plenty, replaced with a new one, problem solved.
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James
63 GMC V6 4speed carryall
65 chevy swb bbw V8 auto
68 K20 327/4 speed, buddy buckets
2002 GMC CC Dually Duramax
64 GMC lwb 3/4 V6 4speed
SOLD
66 GMC swb bbw buddy buckets SOLD
IG duallyjams
The only thing that stays the same is constant change!