^Bingo, glad you got er fixed.
It is disconcerting to hear that the water pump that grenaded only had 50k on it. Sounds like maybe an across the board problem as the new ones are having problems too.
At your mileage, even though the engine itself should yield may more miles, the rest of the truck is old and going to require continued repair and upkeep.
Goo news is, if it's in otherwise nice shape, it will sell for more than one would think it's really worth. It's a good time to sell old diesels. Price of admission for new ones means there's some kid or someone with a skinny wallet that wants a diesel, especially a Cummins, on every corner.