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  1. #1

    Default Transfer Case Leak

    I have a 1999 K1500 with a 5.7, 4L60E and NP8, vehicle has 307K and runs great. The transfer case has been leaking from the PLUG,TRFER CASE ACC HOLE(RUBBER). I have removed the plug, cleaned it and the case well and replaced it but I used silicone sealant around the plug before I put it back in and then around the outside of the plug once it was in. It has set for about 24 hours and I will know later if it still leaks.

    Anybody else had issues with this? I know the case isn't low on fluid, I just put about 1.5 qts in and it wasn't coming out of the fill hole. Any recommendations would be welcome.

    Thanks,
    Jeff

  2. #2
    Jr. Apprentice
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    Default

    Quote Originally Posted by johnsonjf View Post
    I have a 1999 K1500 with a 5.7, 4L60E and NP8

    Anybody else had issues with this? I know the case isn't low on fluid, I just put about 1.5 qts in and it wasn't coming out of the fill hole. Any recommendations would be welcome.
    In the same area you described, I seem to remember that people have a problem with the transfer case oil pump wearing through the rear half of the transfer case housing. Check for cracks or a hole in the rear case half which may cause the fluid to leak out.

    Look at this information:
    http://www.drivetrain.com/parts_cata...aseRepairSaver

    Hope this helps

  3. #3
    Master Mechanic Big75's Avatar
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    Default

    maybe try a fair amount of thread locker or teflon tape instead of silicone. If infact that is where the leak is coming from.
    This post has been rated MA LSV, and is intended for mature audiences. Reader discretion is advised. :fighting0037:
    ghst-_-R3CON83 ----------BATTLEFIELD BAD COMPANY 2----------------------

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  4. #4

    Default

    I've found a replacement transfer case, just a couple of questions. The information on my data plate indicates I have a NP8, the data tag on the transfer case shows 246GM. Are these the same transfer cases?

    Jeff

  5. #5

    Default

    Ok, looks like finding a NP8 transfer case for my 99 GMC Suburban is more difficult and expensive than I thought. I guess I will be transplanting a manual transfer case into my vehicle. So any recommendations and suggestions would be appreciated. Below are the specs on my vehicle so you will know what I am working with. If anybody has a step by step procedure that would be extremely helpful.

    1999 K1500 GMC Suburban
    5.7 L gas
    4L60E transmission
    NP8 Electronic transfer case with 2 rocker switches on the dash

    My email address is diverdad84@yahoo.com

    Thanks,
    Jeff

  6. #6
    Master Mechanic Big75's Avatar
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    Sounds like overkill. is the case cracked? Or do you just have a leak from between two components?
    This post has been rated MA LSV, and is intended for mature audiences. Reader discretion is advised. :fighting0037:
    ghst-_-R3CON83 ----------BATTLEFIELD BAD COMPANY 2----------------------

    (This site won't let me add a real stat generator to my signature)

  7. #7

    Default

    Case already has 3 holes from the pump clip. The pump also makes noise and vibration when going down the highway at spped.

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