Good day to all the BMW family, some help is needed...on our 2005 330xi with the 6 speed, after we shift into second gear, there's a thumping noise right behind the transmission area. I checked the front pumpkin and it is full. We had a used transfer case out in about 10,000 ago. Out car has 275,000 and the case only had 90,000 on it. To me, it sounds like a loose drive line flopping around, don't know if this has a drive line with u-joints. Car still runs like new. The thumping doesn't seem to be as loud after going from first to second, but it's still there when shifting. I appreciate any help.