R6E6I6D

I have a brand new acura TL and it is automatic with every option avalable... ok its not mine cause id never buy automatic but its my fathers and he has taken it to 2 different acura dealerships and they can not figure out what is going on... during light acceleration(in any gear) bttween 2600-2800 there is a VERY noticable tapping/shrieking noise it can be heard inside the "sound dampend" passenger compartment and is even more noticable outside/or with windows down.... if anyone has anyclue to as what the problerm is or has ever had such a problem id be interested in your input, thanks again for all ur help Honda-Tech