My truck recently started a weird squealing noise a couple days ago. I will try to describe the sound. It sort of sounds like a valve tap or exhaust leak in combination with a belt squeal. I only hear it at high boost levels, usually when I take off fast or take off with a heavy load. I appreciate any help

 

Check all your Boost hoses for leaks, make sure all the clamps are TIGHT...

 

Trynto is right. I had a similar noise when I had a '98 12v. It sounded like a very bad water pump. I ultimately tightened the v-clamp on the intercooler side of the turbo to specs (72 in lbs) and the sound went away. John