Transmission goes...vrrrrpp(?!)
 

My 1991 190E 2.6 intermittently has an unusual sound in the 2nd to 3rd shift. It sounds like a deep "vrrrpp" at the shift.

-- sound seems to come from the rear, not the front or tranny area
-- fluids are clean, levels are fine
-- does not do it always, is not just a hot or cold thing
-- does not do it if I really get on the gas pedal, seems to do it more when I am just barely picking up speed

(auto trans, by the way)

brookspw