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Thread: E83 Rear End Noise???

  1. #1
    Join Date
    Feb 2015
    Location
    Charlotte, NC
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    My Cars
    2002 540i M-sport

    E83 Rear End Noise???

    I'm helping sort out my niece's 2005 2.5L w/ 139k miles before she takes it back to NY for the winter. Originally it had a noise coming from the back underside that sounded like the Mind Flayer with indigestion. Replaced the rear drive shaft (Dorman) and guibo (MeyleHD). New tires (General G Max AS-05) went on and I took it out on the highway for a test drive. Side note I was amazed how high the 2.5 RPM's were at 80 MPH, nearly 3k! All of the original noise seems to be gone, now I'm hearing something new in the rear when I'm off the throttle. It seems to be a bit of a whining sound. Don't know if this is a wheel bearing, rear diff bushing or something else. In town, side to side turning does not seem to cause any noise, this is all straight line. Any thoughts? TIA

  2. #2
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    4,334
    My Cars
    2001 525it
    If it's a wheel bearing the sound will change when the car is turning, loading the bearing then turning the other way will unload it decreasing the sound or diff

  3. #3
    Join Date
    Mar 2019
    Location
    ATLANTA GA
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    165
    My Cars
    456 X3s
    When was the rear diff fluid changed...if never or I don't know...it's time at 130k on the clock.

    Sent from my SM-G531H using Tapatalk

  4. #4
    Join Date
    Feb 2015
    Location
    Charlotte, NC
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    2002 540i M-sport
    Quote Originally Posted by X3456 View Post
    When was the rear diff fluid changed...if never or I don't know...it's time at 130k on the clock.

    Sent from my SM-G531H using Tapatalk
    Changing front and rear diff fluid is next on my punch list, xfer case and transmission have already been done. Fluid from both did not look that bad which makes me think both had been serviced at least once before.

  5. #5
    Join Date
    Jul 2007
    Location
    Cave Creek, AZ
    Posts
    868
    My Cars
    1993 850ci 2001 M5
    Check the rear differential mounting bushings for play
    Regards,

    Brian
    Cave Creek, AZ

  6. #6
    Join Date
    Feb 2015
    Location
    Charlotte, NC
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    My Cars
    2002 540i M-sport
    I presume you mean #10 shown in this image. There are many others including #2 & #3. Do they all need to be replaced at the same time or is #10 the usual point of failure?

    https://www.realoem.com/bmw/enUS/sho...diagId=33_1199



    Attached Images Attached Images
    Last edited by Bdevil; 11-07-2019 at 06:42 PM.

  7. #7
    Join Date
    Jul 2007
    Location
    Cave Creek, AZ
    Posts
    868
    My Cars
    1993 850ci 2001 M5
    Bdevil, you are correct, #10 is usually the culprit. See my experience with that here:

    https://www.bimmerforums.com/forum/s...-bad-on-my-e83
    Regards,

    Brian
    Cave Creek, AZ

  8. #8
    Join Date
    Feb 2015
    Location
    Charlotte, NC
    Posts
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    2002 540i M-sport
    Thanks Brian, great write up.

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