I have a quick question about automatic transmissions when the vehicle is in PARK. What kind of state are they in and by that I mean, are there any gears engaged at all? The reason I ask is, my dad was visiting over the weekend and one day when I went to pick him up at his hotel, we noticed the front tires of his 2013 Ford Expedition were up on TOP of the concrete parking block. Upon further inspection, we found his rear bumper was messed up. Fortunately, no other damamage, unless the transmission is messed up, which is what I am trying to figure out. He went back into the hotel and talked to the front desk and sure enough a drunk driver had come through the night before. The hotel called the cops after it happened and my dad called the cops that morning and sergeant showed up in less than 10 minutes to take a statement and give my dad the case number. The drunk asshat had already been arrested. So, my question is, should my dad be worried about the transmission? He drove it home the next day (3 hours) and said it did fine. I am curious what is going on inside an automatic transmission when it is in park. His truck was pushed with enough force to get it up on top of the concrete parking block. Does it hurt an automatic transmission to roll when in park?