2008 mercury mountaineer AWD
While slowly accelerating and between speeds of 35 to 40
it will vibrate for just a second or two and then will be fine.
It's mainly driving and just slowly accelerating and it is
worse after it warms up. It doesn't do it at any other
speeds. Transmission and motor has normal power and
changes gears very fast and effortlessly. Is this possibly
something to do with the AWD system? I have no clue
really how AWD system work. I know they engage the
driveshafts but I don't know how or when AWD systems
engage or disengage or if they ever disengage.