AUTOMATIC TRANSMISSION ON 2000 BMW 323CI WITH 52,000 MILES FAILED IN REVERSE ONLY. PROPERLY MAINTAINED AND DRIVEN LESS THAN 10,000 MILES PER YEAR. INITIAL DIAGNOSIS COST $327.00, AND TOLD ESTIMATED COST OF REPLACING TRANSMISSION WAS $5500.00. NO REASON FOUND AS TO WHY THE TRANSMISSION FAILED. TOLD THAT IF KEEP DRIVING THE CAR THAT THE ENTIRE TRANSMISSION WILL EVENTUALLY FAIL WHICH WAS A SERIOUS DANGER ON THE HIGHWAY.*AK