At 90,000 miles there was a head gasket failure and overheating.
That is probably the cause of the bearing failure. Robbie was retelling the story on his first 80. He lost the PHH on the drive back to NM from Florida where he bought the truck. It overheated and later developed a slight piston slap. He drove it for another 2-3 years until he rebuilt the engine.
With good maintenance, you should get 200k from the rebuild.
-B-