[onewhippedpuppy]

So Bimmerforums hasn't been any help, I thought I'd seek the advice of the Pelican braintrust. The car is a '93 BMW 325i with 150k. The problem is this:

A strange clicking/light knock, that increases with both RPM and speed. I can feel it in the shifter, and it is still present while coasting with the car in neutral or the clutch pressed in. Probably at it's loudest while under acceleration. The noise frequency coincides with RPM and/or speed. Jacking the rear up and running it does not duplicate the noise. Doesn't seem to change while turning either direction. No longer noticable above 60 MPH. It started quietly a few weeks ago, and has steadily gotten worse.

So, any suggestions? Guibo has been replaced, I just did the center bearing this weekend, but no luck. U-joints felt ok when I was under there. I was thinking maybe CV joints, because I have no record of them being done, but there's no obvious tears in the boots (grease caked), and the sound doesn't change while turning. Transmission and diff fluid have both been recently changed with synthetic. I don't have the money to blindly start replacing stuff, so some direction would be appreciated.