I'd say check your belt tension but IMS the 5.9 has a spring loaded tensioner.
In my experience the second leading cause of bad water pumps is stray current through your cooling system. Had this happen on my mom's old car. Went through a water pump per year after we swapped a rebuilt motor into it. Checked all the grounds and they looked fine. Added another ground from a braket near the water pump to the battery negative and stopped eating pumps. Her terrible battery terminal corrosion problem went away too.
You can check with a multimeter. Put the negative probe on the negative battery terminal, take off the radiator cap (cold), start the engine, put the positive probe in the coolant without touching anything metal. I believe anything over 0.7 volts is bad.
I had really bad corrosion on my ZJ's positive battery terminal and I went through two water pumps in about three years. I checked the coolant and was over 0.7 volts. Replaced the negative terminal, the lugs on the negative cables, cleaned the ground to the fender and block. Corrosion gone and still on the same pump.
Just my personal experience.