Any ideas on how this might of happened?

it's likely that when the one hub didn't go on all the way, you didn't get the inside bearing seated properly on the dust cup .... basicly: you put it together wrong ohwell stuff happens ... see the shop manual and follow the instructions for "hub installation" and "wheel bearing adjustment"

bearings will be available at NAPA or such, not too expensive, might as well do the set while you're at it, might have damaged the inner

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot