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Suealing from under the hood

okay ive replaced my serpentine belt, alternator, belt tensioner and pulley and my idler pulley on my 98 GMC Z71 K1500 5.7L and the squealing is still happening i can figure out where its comeing from italmost sounds like its my water pump pulley.

Can You Say “Bingo!”?

It’s probably the pump!

Does This Truck Have A Clutched Cooling Fan?

I don’t know trucks.

However, it seem like a bad fan clutch could possibly scream at you.

I am just a "shade tree’ mechanic but I don’t think the fan clutch will scream at you’