I don't know i this might have something to do with the torque converter or something in the auto. Because as you may know I have a problem with humming when the torque converter kicks in at 75kmh. Get louder and duller the heavier the load.
But since I had it test driven to try and reproduce the noise really heavy loads, I swear I can here and feel faint drumming through the floor when I let the engine slow the car down, when I let the engine slow the car without using brakes, even at 60kmh.
Almost sounds like it's a miss or something. Basically the I6 is sounding gruffer than ever in my car for some reason. Could even be the power steering pump I suppose?

Anyone have the faintest??