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front transfer case leak

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Innerpiece, Apr 27, 2001.

  1. Innerpiece

    Innerpiece 1/2 ton status

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    87 silverado blazer, 305 TBI, 700R4, NP208, corp 10bolt x 2, 32x11.5

    My transfer case seems to be leaking from the front (forward) of the case near where the main body of the case bolts to the front thingy (I hate to use technical terms) ... I can't find any cracks, and It's not leaking too bad, but it's still leaking. I don't think it's the speedo cable, and it seems to leak the most in 4 wheel drive. Any thoughts? How much ATF does a full transfer case hold?

    Thanks
     
  2. ftn96

    ftn96 1/2 ton status

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    I would be willing to bet it is coming from the front driveshaft seal. Not expensive and not too hard to change. 1 afternoon adn about 10 dollars. The T-case (208) holds about 5 qrts.

    Will work for beer, parts and tools.
    90-350TBI-TCI700-241-33"-10/12 bolt w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  3. pcorssmit

    pcorssmit 1/2 ton status

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    Another alternative (the one I use) is to leave the leaks alone. This is part of the Blazer's rust proofing. A slight leak on the driveshaft slings the oil around, leaving a thin protective film on the floorboard to prevent rust. This is why Chevy went to the leak prone slip yoke rear driveshaft in the early 80's.

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  4. ftn96

    ftn96 1/2 ton status

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    LMAO!!! Smit that is a good one. It may as well be true. Gm really has never been on top of the game when it comes to corrosion prevention. At least not till around 95. But those rigs haven't really had the time to set up like ours have. So we will see in the next 5-10 years.
    I personally dont mind a few little leaks here and there. I look at it this way: If its still leaking it still has fluid in it. Its when it stops leaking that you may consider having a problem. LOL!!!
    But I do hate those spots on the driveway. My mom wont let me park in hers. I have to park out on the street and walk up.

    Will work for beer, parts and tools.
    90-350TBI-TCI700-241-33"-10/12 bolt w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  5. Innerpiece

    Innerpiece 1/2 ton status

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    so how do I go about (a) checking that the front seal is the problem (b) changing it ...

    Keep in mind that it isn't leaking at the very front of the tcase ... it seems to be coming from where the front (cylindrical) housing mates to the main (oval) housing (based on where it has gotten clean).

    thanks
     
  6. ftn96

    ftn96 1/2 ton status

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    I guess the best way would be to clean the case off real good and drive it around in 4 hi for a couple miles then come back and see more exactly where is is coming from . Im having hard time picturing it my head exactly by your refering to the "Cylindrical part" that mates to the oval part.
    From what I can remember, there are 3 parts. The front half of the case, the back half of the case and then the rear tailhousing which covers the output shaft.
    I think the cylindrical part you are talking about it where the front driveshaft mounts to the case. There is a fixed yoke and then there is a plate that it bolts to adn then there is the front half of the main "oval" body. I dont think there is a front housing that connects to the main case. I think it is all one piece. But I may be mistaken. Let me look at soem pics and then get back to you. Anyone else have a vivid picture in their minds on this case?

    Will work for beer, parts and tools.
    90-350TBI-TCI700-241-33"-10/12 bolt w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  7. ftn96

    ftn96 1/2 ton status

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    Ok, I pulled some olde posts and sounds like if your leak does not appear to be coming from exactly where the front driveshaft bolts to the T-case, then you may have a leak between the 2 main halves of the t-case at the top and it may be trickling down. For this fix you would have to drop the t-case and seperate the halves, clean the surfaces and then use some rtv or puchase a new gasket and then attach the 2 halves and re-install. Hopefully yours is just leaking from the driveshaft seal and it just getting slung around under there hiding where it is actually leaking from. Wipe it off real good. Hell, use some brake cleaner or gunk and let it leak some more and try to see exactly where it is coming from.

    Will work for beer, parts and tools.
    90-350TBI-TCI700-241-33"-10/12 bolt w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  8. HarryH3

    HarryH3 1 ton status Author

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    There are 6 or 8 bolts that hold your NP208 to the adapter. These bolts thread into the interior of the transfer case. If the bolts get loose, then the lube can leak around the threads. [​IMG] The fix could be as easy as just tightening those bolts back up. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
    It's a great day to be alive...
     
  9. ftn96

    ftn96 1/2 ton status

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    Thanks HAIR. I kept drawing a blank. I forgot about the adapter.

    Will work for beer, parts and tools.
    90-350TBI-TCI700-241-33"-10/12 bolt w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  10. pcorssmit

    pcorssmit 1/2 ton status

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    6 bolts.

    Pete


    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  11. flcpl4fn

    flcpl4fn 1/2 ton status

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    Just an idea, check the bolts where the t-case connects to the tranny. mine had backed off alittle and was leaking. I just tighened them up and the leak was gone.

    '85 Jimmy in Jax, Fl
     
  12. Innerpiece

    Innerpiece 1/2 ton status

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    ok -- I think I have it pinned down to the front seal ... now ..

    (1) is that a tranny seal or a xfer case seal?

    (2) how do I go about replacing it?

    (3) how much does an empty 208 weigh (before I drop it on my face)

    thanks!
     
  13. Innerpiece

    Innerpiece 1/2 ton status

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    anyone??? little help??
     

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