Random Clunking

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  • 1 Post By ColtonCTS
Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, Random Clunking in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I seem to be experiencing a random clunk from the rear (almost a thud thud thud) until it gains some ...
  1. #1
    ColtonCTS is offline Cadillac Owners Fanatic
    Join Date
    Apr 2014

    Random Clunking

    I seem to be experiencing a random clunk from the rear (almost a thud thud thud) until it gains some speed. The thuds are short lived 1-2 seconds. This is when accelerating either during turns or in up-hill scenarios. The throttle generally has to be pushed 40 percent or more for the clunk to appear.
    I believe this to be in the rear end / possibly differential. Never receive any issues with 30 percent or less throttle. It sounds somewhat similar to when I had my rear differential carrier bearing replaced, but I glanced under the car and it seems that is still intact with no see-able issues. Does this sound like normal behavior for a failing rear differential? I've been reading at it sounds like a carrier bearing could go bad causing similar issues, but I wanted to see if anyone has experience or knowledge with this issue? I haven't looked under to check the carrier bearing, but I wanted to see if this sounds possible.

    The car seems to have a bit of a vibration after it reaches speeds of 65+MPH as of recent as well. Overall no other issues besides the normal loud differential that we all experience on these cars lol.
    I do not have much experience with differentials, so any knowledge / guidance is appreciated.

    deepstuff likes this.

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  3. #2
    greenmachineiijh is online now Cadillac Owners Fanatic
    Automobile(s): 2007 CTS 2.7L
    Join Date
    Aug 2017
    Phoenix, AZ.

    Re: Random Clunking

    did you look into the diff bushing/mount(s)? very common going out. adds clunking vibrations, etc.

    Could be carrier bearing for the drive-line, couplers, tranny mount, etc. Just got to get under there and look and pull on things. look for looseness, tearing and separation for rubber parts.

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