So what did the dealer say? I have a vibration at 2300RPM, most noticeable at in 5th (57mph) ir 6th (67mh) with slight throttle pressure. Flip it in N it disappears. I have a 16.5 2.5L Touring. Its driving me crazy. I hate, hate hate dealers and their BS, (I used to work for one) but I might just bring it in. I see yours is a different engine and tranny.