Water Pump Failure Traveling To The Eclipse

I looked at the two pumps, side by side. The differences were minimal. I could find no indication of failure on the old pump. The only thing I could of is the the impeller felt tight when I tried to see if it was lose but when in the engine pumping coolant, there must be a lot more resistance and perhaps it was slipping while pushing fluid. Whatever the case, the new pump works and the truck is running great, until the ne t mechanical issue that is.