Results 1 to 6 of 6

Thread: Clunking From Rear

  1. #1
    Join Date
    Oct 2006
    Location
    Valparaiso, Indiana
    Posts
    378

    Clunking From Rear

    I have a loud clunk from the rear of the car anytime I take off moderately hard, back up and then move forward, or go over large dips/bumps. It sounds like someone whacking the trunk pan with a rubber mallet.

    The suspension is all new: Vogtnland 1.6" drop springs, Air Lift 1000 bags, poly spring cups, SCUI nylon composite bushings in the knuckles and LCA's, newer NOS Motorcraft inner UCA bushings, new Timkin wheel bearings and hub nuts, shorter sway bar end links with poly bushings.

    The subframe bushings look great, not a spot of rust or rot on the car, including the body to subframe brackets that commonly rot out.

    The diff bushings are original rubber from 93, but look like there in good shape (originally what I suspected the clunk was from, I plan on replacing them when I get some time anyway). The 3.27 TL rear end is from my old 95 LX and has had a very hard life from when it was new. It has 115,000 on it and I just noticed the pinion seal is seeping a bit. I had it open about 10,000 miles ago to inspect it before swapping it in and everything, including the original clutches, looked great and was nice and tight. Seems to be functioning properly.

    Nothing under the car has any abnormal play. It drives great. Anyone have any ideas on what it could be or something I missed checking?

  2. #2
    Join Date
    Jun 2008
    Location
    Columbia,SC
    Posts
    608

    similar

    I have something similar happening... mine guessing u joints but I don't know.

  3. #3
    Join Date
    Dec 2007
    Location
    Salem, OR
    Posts
    6,285
    Quote Originally Posted by TBirdJKC View Post
    Anyone have any ideas on what it could be or something I missed checking?
    I chased a similar issue for a long time, and didn't find anything* obvious/abnormal, including a lack of body cracks, hung up moving parts, loose lug nuts, u-joints, half-shafts, etc. etc.. Installed red poly bushings (old were flat/wedge shaped)...no change, so now I just tell myself it's the diff plates locking/unlocking, doing their job as normal. Among the usual suspects, I made sure the fluid was up, w/fresh OEM diff additive.

    * I did have a minor snout seal leak that stopped when I allowed the oil level to settle w/the plug out for a while.
    Last edited by KMT; 08-10-2017 at 08:16 PM.

  4. #4
    Join Date
    May 2002
    Location
    Dallas, TX
    Posts
    5,641
    Check your exhaust hanger rubber straps.

  5. #5
    Join Date
    Jul 2005
    Posts
    380
    Good afternoon


    The differential bushing is what I would check. This is what I do. Remove and swap bushing (top to bottom). Re-torque and look for a deformed and or unusually flatten bushings.

  6. #6
    Join Date
    Oct 2006
    Location
    Valparaiso, Indiana
    Posts
    378
    Quote Originally Posted by SCarSC View Post
    I have something similar happening... mine guessing u joints but I don't know.
    My u joints are also new heavy duty spicers.

    Quote Originally Posted by TbirdSCFan View Post
    Check your exhaust hanger rubber straps.
    Exhaust is good and not contacting anything.

    Quote Originally Posted by sam jones View Post
    Good afternoon


    The differential bushing is what I would check. This is what I do. Remove and swap bushing (top to bottom). Re-torque and look for a deformed and or unusually flatten bushings.
    Sounds like a plan! I'll report back on the results.

Similar Threads

  1. clunking noise from rear
    By Coldgin in forum Technical Forum
    Replies: 8
    Last Post: 04-05-2006, 02:06 PM
  2. "Clunk" from rear end when putting in gear
    By XsithX in forum Technical Forum
    Replies: 10
    Last Post: 10-03-2003, 05:25 PM
  3. Odd buzzing sound coming from rear of car.
    By syphon in forum Technical Forum
    Replies: 5
    Last Post: 03-24-2003, 07:25 PM
  4. rear clunk from the back....ahh! I hate it
    By bigcletus94 in forum Technical Forum
    Replies: 6
    Last Post: 08-23-2002, 05:36 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •