drivetrain noises
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  • 1 Post By btlegacy
Cadillac STS Forum - 2005 through 2012 Discussion, drivetrain noises in Past Cadillac Vehicle Discussion; ok i just did poly engine mounts and poly rear diff bushing. Now im hearing some mettalic noises from driveshaft, ...
  1. #1
    Charles Warren's Avatar
    Charles Warren is offline Cadillac Owners Fanatic
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    drivetrain noises

    ok i just did poly engine mounts and poly rear diff bushing. Now im hearing some mettalic noises from driveshaft, we put the car in the air and rocked the rear passenger wheel and yes the transmission has a lilttle play but sounds normal but the sound is coming from under the heat foil piece. Im aware its a 2 pc driveshaft but thats all i know, we rock the tire and it has this clunk sound. What made me even put it back in the air was the motor mount recheck which i placed the car in r then drive then brake then gas to see if engine jumps. No engine movement but i hear a ting knock sound so this lead to us putting it in the air and turning the tires to dupilcate what we were hearing. Could this be a bearing a u joint?????

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  3. #2
    btlegacy is offline Cadillac Owners Member
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    Re: drivetrain noises

    The diff is going to have a little play when moving the wheel and you will hear a bit of noise from moving it back and forth. If the case has streched or the bearings are damaged inside then you will see excessive play and noise.

    Most likely in your case the center carrier bearing which is the bearing the sits in between the two pieces like the one pictures below:

    Charles Warren likes this.

  4. #3
    Charles Warren's Avatar
    Charles Warren is offline Cadillac Owners Fanatic
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    Re: drivetrain noises

    Can't replace myself?

  5. #4
    btlegacy is offline Cadillac Owners Member
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    Re: drivetrain noises

    Yup, I replaced mine on my own. Exhaust has to come down and the driveshaft will need to get disconnected to bring it out to pull off the bearing.

    There are aftermarket and OEM versions available

    http://www.gmpartsclub.com/oem-part/...aring/88951975

    http://www.amazon.com/Cadillac-88951.../dp/B00BC21IC4

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    Charles Warren's Avatar
    Charles Warren is offline Cadillac Owners Fanatic
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    Re: drivetrain noises

    I got the gm one from dealer yesterday for 115 after tax. Can you press it in or you took it somewhere to have it pressed in? I have access to lift but they keep telling me we'll have to send it somewhere else because they don't have a press

  7. #6
    Charles Warren's Avatar
    Charles Warren is offline Cadillac Owners Fanatic
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    Re: drivetrain noises

    ok, so the carrier bearing isnt the culprit in my case. i broke my driveshaft. wonder if the poly mounts played a role in this hmmmmm. im just gonna get driveline here in atlanta to build and balance me a 1 piece driveshaft. everyone tells me the 1 piece feels better and puts a tad more power to the ground.

    ----------

    well just off the phone with the guys at the driveshaft shop and unfortunately our cars cant use a 1 pc but they can fix it and balance both front and rear pieces for $200. ive been looking on ebay at used units but scared to go that route due to not knowing what broke mine

  8. #7
    1BadCadSTS's Avatar
    1BadCadSTS is online now Cadillac Owners Connoisseur
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    How did you break a driveshaft? Ls1s destroyed stock aluminum ones but not steel and they put down more power than our cars.

  9. #8
    Charles Warren's Avatar
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    Re: drivetrain noises

    dude i dont know lol. i got a nuclear reactor on bank 1 and 2 lmao. i think the steel is just the outside while the inside is aluminum. wont know until i take it off. its still drivable but it makes clunking noise and metallic pinging noise on the rear shaft. i think ive made over 500 passes lol, im ruff on her.

  10. #9
    Charles Warren's Avatar
    Charles Warren is offline Cadillac Owners Fanatic
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    Re: drivetrain noises

    Well got car on the rack and tech at atlanta drive line service said everything is normal and the center carrier is fine and the shaft is not broke. The slack is in the rearend which is normal

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