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Hi,
I have just started noticing a kind of rolling thump that happens when I accelerate in first gear and somtimes in second. It happens just behind me in the transmission area. But the tranny is working fine it's almost like a U joint is thumping can any one help me with a diagnosis?
 

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Most of the time its just a bad center bearing support. Don't let it go for too long or you'll need a rebuilt driveshaft (BMW shafts universal joints cannot be replaced "easily"). It could also be a seized universal joint but 99% of the time is the bearing support (go here for more information).
 
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