My 1990 535i has a (fairly light) vibration from about 50 - 65 Mph. I just put new wheels and tires on the car, and that had no effect on the vibration. The vibration is not felt specifically through the steering wheel, rather is is non-specific in nature. It happens in any gear and even in neutral, at the speeds I indicated.

I am going to replace the upper and lower control arms and sway bar ends as general maintenance, but based on my experience with my '95 530i and my '89 535iA I don't think that is the problem. I am thinking that it may be driveshaft related. I also think that a caliper in the rear may be hanging up slightly, could that be a cause? What do you experts think? Is there anything else I should be looking for?

Thanks in advance for your help.
- Hal