BMW Repair: highway speed vibration, speed vibration, aftermarket wheels

Question
Hi Don, If you remember, i have the 2004 545 with a manual trans that has the vibration around 70 mph. Well, I changed out the driveshaft and its still the same. Any other suggestions? Thanks.

Answer
Sorry for the delay Paul,been busy here.You wouldn't have aftermarket wheels on the car by chance?I know (at least I think you said)they were balanced,are they "true" by that aren't bent at all.We have discussed many things,it is kind of hard to help with repair when I don't see the car.The reason I mentioned aftermarket wheels is if the offset was different then that of factory wheels.While sitting here I am thinking of different things,the 545 is a turbo correct?Check the alignment to see if the rear is following the front in a straight line.I am kind of lost not being able to see the car,