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Thread: Clunk sound

  1. #1

    Default Clunk sound

    I have a 2009 Silverado with 26k miles. When I pull up to a stop and sit for awhile I get a clunk sound and it feels as if someone has hit me from behind. I'm guessing it is coming from the transmission--maybe the torque converter down shifting?? Does anyone else have this problem, if so-what did you do to correct it?? Sometimes it happens right away and sometimes it happens a few minutes after sitting for a red light. Any help out there?? Thanks!

  2. #2

    Default

    this is a VERY popular topic with our trucks, use the search feature...

    it is your slip-yoke, you must apply some lubricant to it
    2000 Chevrolet Silverado

    Powertrain:
    4.3L V6, 4L60E, 2WD, Single Cab
    Performance:
    Airaid CAI
    Poweraid TB Spacer
    Flowmaster 10-series exhaust (dumped)
    BLACKBEAR TUNED!!!
    Edge CS insight monitor
    4.10 gears
    Limited-slip differential
    LS-1 Dual Electric fans
    Corvette tranny servo swap

    Audio:
    Head Unit: Alpine
    Speakers: Alpine SPR-60C 6.5" component set, 4X6 Infinity Kappas
    Subs: 2-12" Kicker CVT's
    Amps: Alpine-M1000 (subs), Alpine MRX-F65 (Speakers)


    Tires/Wheels:
    305/70R16 NITTO Terra Grapplers
    16" PROCOMP 7089's
    Suspension:
    2" leveling kit
    3" Fabtech Spindle Lift Kit
    Front/Rear-Bilstein 5100 shocks

    Lighting:
    FRONT
    35W HID Low Beams
    RECON LED smoked roof cab lights
    REAR
    HELLA LED taillights and 3rd brakelight
    HELLA FF-75 Aux. Reverse Lamps
    RIGID dually D2, flush mount, wide beam
    Accessories:
    Hawk HPS Brake pads
    Russell braided steel brake lines
    Powerstop-red powdercoated brake calipers
    Powerslot Cryo brake rotors
    EGR in-channel window visors

  3. #3
    Legend

    Join Date
    Sep 2010
    Location
    everett, massachusetts
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    1,489

    Default

    Quote Originally Posted by Ruby Red View Post
    I have a 2009 Silverado with 26k miles. When I pull up to a stop and sit for awhile I get a clunk sound and it feels as if someone has hit me from behind. I'm guessing it is coming from the transmission--maybe the torque converter down shifting?? Does anyone else have this problem, if so-what did you do to correct it?? Sometimes it happens right away and sometimes it happens a few minutes after sitting for a red light. Any help out there?? Thanks!
    I had this occur when my truck was under warranty , they replaced the transfer case fluid and the clunk disappeared for about 40,ooo mi so I replaced this transfer case fluid again and no clunk.

    service manager stated it is because the fluid looses it lubricating abilities and the drive shaft will not slide when first starting to move at a stop like a light//stop sign ...I had it do it mostly when it was cold out at first.

  4. #4

    Default

    Thanks for the help! Yes, it was the slip-yoke. I dropped the drive shaft, lubed the splines on the yoke, put it back together--clunk gone for now!! Thanks again.

  5. #5
    Legend

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    Sep 2010
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    Default

    Quote Originally Posted by Ruby Red View Post
    Thanks for the help! Yes, it was the slip-yoke. I dropped the drive shaft, lubed the splines on the yoke, put it back together--clunk gone for now!! Thanks again.
    I would check the transfercase fluid to be a nice blue color. if its getting a grayish color replace this fluid.

    most replace this fluid in work trucks every 40,ooo mi. or sooner like plowing etc..
    Last edited by j cat; 05-30-2013 at 03:39 PM.

  6. #6

    Default

    good advice, but mine is two wheel drive!

  7. #7

    Default

    You need a nickel plated slip yoke, put one on mine almost 4 yrs ago and not probs since.
    01' 1500 LT Z71 ECSB 5.3L
    line-x'd front brush guard with KC Daylighters, 6000k HID lows and highs, rewired highbeams, Trans-go mild shift kit, custom stainless duals, 3500 dually OEM taillights, K&N CAI. Still have OEM fender flairs and leveling kit in boxes waiting for time.


  8. #8
    Legend

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    Sep 2010
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    Default

    Quote Originally Posted by Ruby Red View Post
    good advice, but mine is two wheel drive!

    since it is 2wd with what you did should take care of it,...

  9. #9

    Default

    I would think so, the plating allows it to move easier so it shouldnt matter if its going into a tail housing of a transmission or a transfer case.

  10. #10
    Jr. Apprentice
    Join Date
    Aug 2011
    Location
    Long Island, NY
    Posts
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    Default

    Quote Originally Posted by shibby2oo8 View Post
    You need a nickel plated slip yoke, put one on mine almost 4 yrs ago and not probs since.
    Any idea of the cost of the part? Did you install it yourself or have a mechanic do it? Thanks
    2004 GMC Sierra SLT Z71, Truxedo Low Pro QT tonneau cover, Rhinoliner bed liner, Putco side rails, Weathertech window deflectors and floor mats, AMP Research bed extender, GMC cloth seat covers, light bar, lights and more to come.

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