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Not to keep on beating a dead horse... But I finally got around to putting my old belt back on today. Don't even know what brand as it's worn off, or was never there. It was on when I bought the truck.
I also sprayed a little bit of Justice Bros 80 lubricant under the water pump pulley, into the area of the bearing.
I haven't heard a squeak since. I should've done one at a time I guess, but I'll know what it was if it comes back.
I guess I might've changed the belt simply because I did the wrap around upper radiator hose and had access... The Gates HD is potentially crap. Time will tell.
Glad you fixed your squeal. Hope it stays that way for you.
I wouldn't call it 'beating a dead horse' if the information that you share in this thread would help another person out troubleshooting their problem, who is learning to work on their vehicles...like me.