Thanks for the input.
It's the strangest thing though...
I was having no leaks, and no overheating problems. Saturday, upon starting up the X the serp. belt popped off. I put it back on thinking that maybe the a/c compressor locked up but then upon starting it up again the belt popped right back off.
I then noticed that the pulley on the water pump was moved forward about 1/2" thus making the belt jump off. It was easy to rock the fan back and forth, so I assumed the bearings in the water pump were worn out.
So, yesterday, I tackled the job...removed the radiator (very simple), remove the fan clutch/fan (not so simple...the fan clutch tools at autozone do not fit 4.0's even though it lists them on the box...but we made our own wrench to fit and used a strap wrench on the pulley.) After taking the fan clutch off, the pulley literally fell off the shaft. I then took off the water pump but the shaft seems very tight so I'm afraid that the pump itself was ok.
So, I'm now waiting on the new pump to get in...takes 4 days for a sohc, whereas the ohv was in stock. If the new water pump includes the pulley then I'm going to use it...if I have to use the old pulley, then I'm going to send the new pump back and just replace the pulley (save some $.)
Any thoughts on the pulley/pump situation?