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Weird vibration at 90-100 mph - doesn't exist with extra weight?!

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    #16
    Thanks for the suggestion's guys - I'll be finding out if it's the bearing soon, hopefully. ;)
    - Sean Hayes

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      #17
      UPDATE

      So, I did some more high speed driving this weekend.

      Out on the highway, and some other roads - some pretty loud/can definately feel in da butt, vibrations at 90mph and up to about 105. Pretty damn apparent.

      On the way back from the hills, I realized that at certain RPM's, at any speed, there's a slight...rattle that comes from the rear. Almost like the diff is loose or something, and it's noticeable at that given load range.

      I got udnerneath the car this morning, and everything is tight. I thought it might be the diff loose or a loose halfshaft - everything is tight.

      So, here's another idea. Maybe my diff is low on fluid? Maybe it leaked some when I first filled it, and it's not full?

      My other, and most likely idea, is that one of my bearings only makes noise at a given RPM. However, I changed the load ever so slightly, and the noise changed. This leaded me to believe it was driveshaft related or something around teh diff. I'm really at a loss.

      I'm pretty sure the driveshaft is good, but maybe my u-joint is goin or somethin.

      Just wanted to throw this up there. ;)
      - Sean Hayes

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        #18
        Did anyone have anything to add on this matter?
        - Sean Hayes

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          #19
          Originally posted by Sean
          Maybe my diff is low on fluid?
          easy to check - pull filler plug and stick your pinky finger in there

          Originally posted by Sean
          I'm pretty sure the driveshaft is good, but maybe my u-joint is goin or somethin.
          CSB condition ?
          -----Zen and the Art of e30 Maintenance - / - Zen TOC - / - Zen Summary

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            #20
            oh - and i'd also rotate tires..

            double-check easy stuff first

            .
            -----Zen and the Art of e30 Maintenance - / - Zen TOC - / - Zen Summary

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              #21
              Have you checked wheel bearings?

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