Hi Newbie here, recently bought my 1st Bimmer, a 2004 X3 3.0i, very 1st week I noticed clunking from rear and acceleration problems. Took car back and dealer quoted a new prop shaft joint? Sorted it out for me and I got it back, bit still same problems so had to return car again. After a long delay and a lot of complaining from myself they agreed to fit a new transfer box. Got it back yesterday and ...yep you guessed it...same clunking and acceleration problems although not quite as regular as before new box. Has anybody got advice? I have read on here that it could be down due to a tyre mismatch? Or should I call it a day and ask for a refund? Cheers