4x4 low transfer case noise

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by bandy, Mar 23, 2009.

  1. bandy

    bandy New Member

    1500 hd 2001 6.0 litre 4l80e autotrac tcase

    button shift

    When I engage my 4 Low gear, I hear a loud clung... and it does not engage at all. Then, when I try to put it into neutral and then succeed to put into 4 Low, again, I have a loud clung. When I finally succeed to kick into 4 Low, I have all the trouble in the world to get it back to 2 Hi.

    Does anyone have any suggestions as to what the problem is?:grrrrrr:
    Last edited: Mar 23, 2009
  2. MrShorty

    MrShorty Epic Member 5+ Years 1000 Posts

    What year/model? push button shift or lever shift?
  3. Jacqson

    Jacqson Rockstar 100 Posts

    It may be the Transfer Case Actuator which is not allowing full engagement of your gear selection. Your TC is an NVG246 which has clutches for the Auto 4WD feature.
    Last edited: Mar 29, 2009
  4. tlperry68

    tlperry68 Epic Member 5+ Years 1000 Posts

    Are there any problems geting it into 4 hi?
    Are you comming to a full stop before you engage 4 low? If not, put the truck into a full stop, put the tranny in neutral and try 4 low.
    I'm not sure how autocase works but give it a try.
  5. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    Make sure all 4 tires are the exact same size. If the tires are not a matched set the truck will be very hard to shift in and out of low range.
  6. bandy

    bandy New Member

    yes np 246 t case auto 4x4
  7. ippielb

    ippielb Epic Member 5+ Years ROTM Winner 1000 Posts

    When you try to get back to 2wd, put it in reverse, then back in drive. It should kick it out of 4.

    GOTSAND4ME2 Rockstar

    hi there
    I have the same exact problem with my 2000 1500 silvy. Usually after a couple of tries it goes into and the comes out of 4 low never seemed to bother me since I dont four wheel in a rush, just like to take my time:lol:
  9. rfrankli

    rfrankli New Member


    I have similar problem (and truck as yours)- except 4 low will not light-up or engage. I now have a 4wd service light on. Question- how do I determine which transfer case I have so that I know whether to use Dexron III or ATC Fluid instead (I know they are NOT interchangeable).

    99 GMC Suburban k2500 7.4L
    204k miles (have owned truck only 4 months).
  10. Jacqson

    Jacqson Rockstar 100 Posts

    There is a tag on the back end of your T-case with the model number on it. I think your case is either a 241 or 243, I'm not positive. If your not sure go to the dealer and give them the VIN from your truck and they will be able to tell you which T-case you have and what type of fluid to use.

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