Solved...
I could not replicate any of the noise when parked (even lifted). I hoped that this could possibly point to airflow related. So, I tore apart my cowling, where I had not been too concerned about fit upon reassembly because I bought the truck 12mo ago with all of those little plastic spring screws popped up. Anyway - I could not tell after disassembly of cowl, cabin filter holder that anything was amiss, but when I re-assembled it...was VERY cautious to ensure everything was fitted just right (I just could not lock anything into place). Well, the noise is gone and truck drives JUST right! I really wish those spring-loaded screws were sold individually or could resist failure past a few uses. Thanks to those who offered advice, and I will be looking into those upgraded belts at my next replacement!
Adam
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