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NP241 case leaking

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by JIMs70K25, Sep 29, 2005.

  1. JIMs70K25

    JIMs70K25 1/2 ton status

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    I got a leak where the case halves are mated, it's on the side of the case near the front output. What's involved with seperating the halves and re-sealing? I'd like to do it with the case attached to the tranny. Does the rear slip joint need to be removed first? Although it's stock I can get the burb in the air to have plenty of room to work. Thanks for any help.
     
  2. btolenti

    btolenti 1/2 ton status

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    CHeck here for instructions on how to split the case halves....I have heard you can do it without dropping the case....
     
  3. JIMs70K25

    JIMs70K25 1/2 ton status

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  4. btolenti

    btolenti 1/2 ton status

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  5. JIMs70K25

    JIMs70K25 1/2 ton status

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    Thanks! Looks like the hardest part will be the pump pick-up in the back case half. What type of sealer should be used between the case halves?
     
  6. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    yeah you can... removing a case takes very little time though id just remove it and do it on a table... i worked for john deere heavy equipment here in vegas and i did over 40 huge ass ZF transmissions like that. use some good high flex gasket maker...
     
  7. btolenti

    btolenti 1/2 ton status

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    the hardest part is definitely trying to get the back case half back on with the pump in the correct place. I just used high quality RTV to seal the case halves together.
     
  8. K5Chris

    K5Chris 1/2 ton status

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    if its just a small leak at the seam....... i wouldnt take it apart..... mine leaked too. i drained it.... cleaned the surface real good..... and put some RTV on the seam on the outside, and refilled it.... hasnt leaked since.

    i have taken them apart before.
     
  9. btolenti

    btolenti 1/2 ton status

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    it may be a good time to get in there and change the chain and maybe the shift fork pads....depending on the mileage on the case.
     
  10. JIMs70K25

    JIMs70K25 1/2 ton status

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    That's what I was thinking, the burb has 221K on it. Thanks!
     
  11. JIMs70K25

    JIMs70K25 1/2 ton status

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    Took it off today...

    Pulled the t-case today. Not bad at all. Looks like it had been gone through before, shift pads looked new and the chain was good and tight. Pulled it myself, not too heavy set it on my chest and then shifted from under the truck. Going to have an extra set of hands to put it back on tomorrow morning. The directions above were right on. Real simple to disassemble and put back together. Thanks for the help!
     
  12. surpip

    surpip 1 ton status

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    i did my case with black rtv, no leaks at all, just use a little bit, thin film on the mating surfaces
     
  13. JIMs70K25

    JIMs70K25 1/2 ton status

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    Got it on and full of fluid. SUCCESS! Time to enjoy driving her!
     

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