I can't remember if I did this before or after the Utah trip but I'll post it up now. It would make sense that I did it before a long trip.
I wasn't having any issues but went ahead and replaced the water pump. A 6bt pump is suppose to work so I ended up on ebay searching. I wanted to make sure I got a replacement with the shroud covering the fins as I think those are a little better for flow. Here's the one I found next to my original.
It's pretty easy to get to in my setup with electric fans.
This one was challenging to get right as there are several variations to the belt tensioner. I wanted to replace my replacement since it was squeaking again and I wanted to use a different brand than daystar (my replacement). I finally got one that was correct for my 4bt and here is the winner.
You can see on the backside how they machine off the nub depending on the application.
The all important part number. It's a gates brand.
I also made a new mounting plate out of a little thicker material.
No more squealing and coupled with a new radiator and water pump I dropped operating temps 5 degrees with better load cooling when hitting the hills.