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NNBS transfer case issues please help

Discussion in 'OPEN TRUCK DISCUSSION' started by fortplainman, Jan 3, 2016.

Car Parts
  1. fortplainman

    fortplainman Custom User Title

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    so long story short a little more than 2 years ago i had my transfer case go on me. every time i put any power in reverse it would seem to drop out of gear and have a nasty grinding noise. a snap ring broke on the shaft and essencially caused a shitload of shrapnel in it and i had it replaced with a gm remanufactured unit.

    so fast forward to the past couple weeks, had the same thing happen from what the tech told me. i dont care about fixing it, that isnt the issue. my issue is if anyone has heard anything like this problem in other nnbs trucks and if they had a lift/tires/tune/gears etc. i have looked around a couple forums and have found nothing. i just dont see what could cause a second transfer case to blow up on me or how/what can be done to strengthen so so called snapring from breaking.
     
  2. 1BADSS396

    1BADSS396 Chief Pot Stirrer

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    What is a NNBS? :dunno:
     
  3. daddy

    daddy Administrator

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    Assuming you mean the GMT900, I don't recall this being a common issue.

    Did the rebuild have a warranty?
     
  4. fortplainman

    fortplainman Custom User Title

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    The rebuild only had a 18 month 100k warranty and it's 27 months old and 20k miles

    FFB device
     
  5. daddy

    daddy Administrator

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    Have you spoken with them yet?
     
  6. fortplainman

    fortplainman Custom User Title

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    Working on it

    FFB device
     
  7. Nick The Great

    Nick The Great The lead sled dog is the only one with a decent vi

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    It's the generation of trucks before the NNNBS. Duh :rolleyes:
     
  8. PenguinLTZ

    PenguinLTZ Administrator Staff Member

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    Man, that is crazy. I have not heard of this issue.

    Let us know what they say.
     
  9. fortplainman

    fortplainman Custom User Title

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    found a service bulliten on gmt900 trucks made before april of 2008. snap ring on the rear output shaft was a different hardness rating that they changed and could break. causes grinding/howling/transfer case disengaging under load which my truck would do.
     
  10. Darkanion

    Darkanion The space intentionally left blank.

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    Hopefully that's all that's wrong with it! :thumbs:
     

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