Clunk is there a rear motor mount?
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Cadillac STS Forum - 2005 through 2012 Discussion, Clunk is there a rear motor mount? in Past Cadillac Vehicle Discussion; 2007 STS AWD At shift times the car makes a wicked clunk (from the back) but only sometimes and a ...
  1. #1
    EddieD is offline Cadillac Owners Member
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    Clunk is there a rear motor mount?

    2007 STS AWD

    At shift times the car makes a wicked clunk (from the back) but only sometimes and a mechanic I mostly trust told me its a motor mount in the rear of the car?
    Is there a mount back there that can make this noise? Can anyone show me where I can order it because when I call autozone they said maybe a rear differential mount but they could not order it and I would have to call GM
    I tried rock auto and cant find something like that.

    Thanks for any help

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  3. #2
    R/T kota's Avatar
    R/T kota is offline Cadillac Owners Fanatic
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    Re: Clunk is there a rear motor mount?

    Trans mount maybe?

  4. #3
    EddieD is offline Cadillac Owners Member
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    Re: Clunk is there a rear motor mount?

    could trans mount be in the back of the car?
    It comes from under the back passensgers

  5. #4
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Clunk is there a rear motor mount?

    That sounds like the differential mount bushing; a known trouble point.
    my_bro likes this.
    Don't mess with Binky Bear!


  6. #5
    1BadCadSTS's Avatar
    1BadCadSTS is online now Cadillac Owners Connoisseur
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    Quote Originally Posted by dkozloski
    That sounds like the differential mount bushing; a known trouble point.
    Winner

  7. #6
    EddieD is offline Cadillac Owners Member
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    Re: Clunk is there a rear motor mount?

    I looked for this part and cant seem to find it anywhere - would one of you guys mind pointing a noob in the right direction

    I called Cadillac and they said they don't sell the bushing separate I would need the entire cradle for $700
    someone please tell me that's wrong.

  8. #7
    R/T kota's Avatar
    R/T kota is offline Cadillac Owners Fanatic
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    Re: Clunk is there a rear motor mount?

    Just doing a quick search myself and searching for the STS part is hard to find, but all kinds of performance diff mount bushings come up for the CTS V and camaro.
    Probably the same bushing.

  9. #8
    CSTech's Avatar
    CSTech is offline Cadillac Owners Member
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    Re: Clunk is there a rear motor mount?

    Yes, these bushings are notorious for going out in these Cadillacs. If you also seem to be getting a clunk while driving through a parking lot, on and off the clutch, this bushing is the reason. We have this bushing and also a tool to remove the OEM and install our bushing. The tool allows you to leave the differential in the car, making the job go from six hours to an hour and half. Any questions, just ask.

    Link to our bushing: https://creative-steel.com/store/ind...duct_list&c=46

    Thank you,
    Jordan
    my_bro likes this.
    Jordan @ Creative Steel Inc.

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  10. #9
    Midnight is online now Cadillac Owners Fanatic
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    Re: Clunk is there a rear motor mount?

    Here's my thread where I install the above mentioned bushing with their tool:

    http://www.cadillacforums.com/forums...placement.html

    Wish I took more pictures. It was a hard job, but I was also being pretty careful since it was my first one. (Edit, I see at least 2 that are broken now, thanks a lot photobucket, as they worked before)

    Still going strong 2 years/~40k miles later.

  11. #10
    EddieD is offline Cadillac Owners Member
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    Re: Clunk is there a rear motor mount?

    Ok so I found the bushing and hell yea it is SHOT!

    Creative Steel thank you for making this option and the link...
    your link says 05 and 06 STS and I have an 07
    will the bushing fit?

  12. #11
    CSTech's Avatar
    CSTech is offline Cadillac Owners Member
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    Re: Clunk is there a rear motor mount?

    I cannot find our information on an 07. One thing I will say though, if you'd like to test it, we'd be more than willing to send a bushing out to you.

    Thanks,
    Jordan
    R/T kota likes this.
    Jordan @ Creative Steel Inc.

    503-316-1811
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    We're on Facebook! https://www.facebook.com/pages/Creat...39612609499435

  13. #12
    EddieD is offline Cadillac Owners Member
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    Re: Clunk is there a rear motor mount?

    Thank you Jordan I am ordering it on the phone with you guys now

  14. #13
    LAC_STS is offline Cadillac Owners Enthusiast
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    Re: Clunk is there a rear motor mount?

    Somebody should make a sticy for this. I wish I would have took some pics last night when I did mine.. The way to tell if yours is bad is to either look at it or if you cant tell by looking at it if you crawl under the car and push up on the drive shaft where the rubber coupler is if its bad you will be able to move it up and down.


    I did mine last night without the special creativesteel tool. I undid the mounting bolts to the rear diff then undid the 6 bolts where the driveshaft/rubber coupler is then the rear diff will tilt down. Then I used a pair of pliers to pull the inner rubber part of the bad bushing out. I then used a sawzall to cut the old bushings sleeve out. Putting the new bushing in seemed a pain but I put the bushing in the freezer for 45 mins then it slid in pretty easy with a bolt, washers, and nut.

    Not that bad. One other thing is to get more room I released the exhaust from the hangers via the rubber things that hold them on. Very easy to do and gives a lot more room. I would have been able to do this job in about 2 hours but I already had this done once about 2 years ago when my STS was under warranty. Apparently when they did it they used red thread locker on the 6 drive shaft / coupler bolts. So I had to use a torch to heat them up before I could get them out. I have a 750 ft lb pneumatic impact wrench and it wouldn't even budge the bolts without heat.

    Here is a video showing how to cut the old bushing out. It also shows how the rear diff tilts down when you take the mounting bolts and driveshaft bolts out.

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