What Hiro said :) Have you had your transmission serviced properly? As in fluid flushed, fresh oil and new casket? Apparently it should be done every 25,000Km I was told... bit excessive I think. It's not too expensive either. But if you do go to a transmission specialist, make sure they tell you what they are actually going to do or ask them how they are going to do it. They should put a new casket in and fresh oil, inspect, etc. Some places are so dodge and rip off when they say they serviced it they mean they topped up the oil and nothing else.