The car gods frowned on me yesterday - I was running errand in my 1995 740i automatic. Stopped in front of a speed bump, put car in Park to wait to proceed and when I shifted into drive there was a dull thump and felt like a mis-shift and then it went into gear. A few miles down the road as I was pulling away from a stop it again felt like it shifted into neutral and stayed there. Engine was running smooth before and after. Had it towed to my mechanic and when they checked it this morning it was running rough and they checked oil pressure in engine and it was 0. Don't want to run until they can determine cause of no oil pressure and can't diagnose transmission without engine operating! Any clues or experience as to how to proceed appreciated.