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Transmission Knock on 2001 sierra 2500?? help?

Discussion in 'GM Powertrain' started by quicksilver8817, Mar 3, 2012.

  1. quicksilver8817

    quicksilver8817 Rockstar 100 Posts

    My buddy has a 2001 sierra 2500 4x4 with about 80000 miles . On start up there is a knock coming out of what seems to be the front of his trans. As the truck warms up the knock gets quieter .. someone told us it was the torque converter and i was wondering if anyone has had an issue like this before ?
  2. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    Are you sure it isnt a lifter??? the 6.0L has noisy lifters just like the 5.3L?? kinda trying to get an idea of the noise here.
  3. quicksilver8817

    quicksilver8817 Rockstar 100 Posts

    im pretty sure but im not positive .. ill take a video and post it when i get a chance
  4. quicksilver8817

    quicksilver8817 Rockstar 100 Posts

    well it ended up being a cracked flywheel

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