2007 Pontiac GP 70,900. This only has happened about six times in the last month in varying degrees of harshness. Fluid is really light pink. I'm going to check those mounts this weekend. I don't have the space at the moment to do the filter and fluid change. I might take it in for that. There is a real slow leak that I noticed when I did my last oil change 900 miles ago, coming down from the trans cooler line. The levels seem to be adequate though.