High Pitched chirp/squeek in 2000 Sierra

Discussion in 'General Chevy & GM Tech Questions' started by mledford0005, May 5, 2010.

  1. mledford0005

    mledford0005 New Member

    I have a 2000 4x4 ext cab GMC sierra and it has some kind of high pitched chirp/squeeking sound coming from what i believe is the drive train somewhere. I have sprayed all the u-joints with WD40 and still chirps. The sound seems to coincide with the rotation and speed. At first it was hit and miss and now it is a constant thing. The drive shaft that goes from the transfer case to the differential can be turned by hand about 1/4 to 1/2 and inch, is this normal? I have not yet checked the differential fluid either. Any ideas of what it may be?
  2. bigdaddy77084

    bigdaddy77084 Epic Member 5+ Years 500 Posts

    U-Joints are sealed so wd40 wont help..
  3. mledford0005

    mledford0005 New Member

    ok. well should the drive shaft from the transfer case to the fron differential turn by hand at all?
  4. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    Yes.. That is normal. i dont remeber the exact specs but yours sounds a bit tighter than most. As for the chirping i would really lean twards bad U-joints. The noise you are describing sounds exactly like them.
  5. Loggerhead Mike

    Loggerhead Mike Rockstar 100 Posts

    yes, you are feeling the backlash in the gears.

    take your rear prop shaft out and see if the ujoints turn smoothly in all directions. more than likely you've got a shot joint

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