Thanks Big Jim. This is a tough one. Parked and reving the engine up..it goes smooth as normal. At 45ish under throttle I feel the vibration the most, then if I switch to neutral I think less vibration but its hard to tell because I'm slowing down. No steering wheel vibes. Could it be water in the tranny?? I went thru an boot high puddle(sorry, I just remembered that). And the tank was filled up Friday. ?? I notice the tank going down when I hear the rumble of the vibration, again under throttle. If I drive slow the needle stays where it is.