Thumping

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  • SpeedWiz
    Noobie
    • Jul 2009
    • 31

    #1

    Thumping

    In first gear when i try and get on it my e30 325iC sounds like it wants the buck the diff. out. lol
    does anyone now how to fix the problem?
  • jlevie
    R3V OG
    • Nov 2006
    • 13530

    #2
    That is almost always caused by a failure of the rubber mount of the CSB. Which in turn is caused by binding u-joints in the drive shaft. The fix is to replace the drive shaft and CSB. While you can replace just the CSB for a temporary fix, until the drive shaft is replaced the new CSB will have a short life.

    FYI: The drive shaft u-joints are not field replaceable. Machining is required and after the u-joints are replaced the drive shaft must be balanced. A new or reman drive shaft is the only option.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

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