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Tranny drains transfer case leaks

Discussion in 'The Garage' started by ecameron87, Nov 17, 2005.

  1. ecameron87

    ecameron87 1/2 ton status

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    I just noticed my TH350 slipping. When I went to inspect it, I found that the fluid was low and that the fluid is blowing out the vent hole on my transfer case (NP205.) I suspect that the rear seal on the transfer case is leaking which is strange because it was rebuilt 10 months ago. What is the fix for this? I though that it was OK for the fluids to intermix as long as the fluid is the same. Why is it leaking ou the transfer case vent hole?

    Any help is appreciated.
     
  2. sweetk30

    sweetk30 professional hooker Premium Member

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    same problem on my old truck. found the adaptor seal was in backwards. i had the hd adaptor with 2 seals. the tranny side one was at failt.
     
  3. ecameron87

    ecameron87 1/2 ton status

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    So I do have to pull the transfer case? I was hoping for an easier solution. I was hoping that the tranny and transfer case could just get along and learn how to share.
     
  4. sweetk30

    sweetk30 professional hooker Premium Member

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    not a good idea. the old 205 take gear oil. autos dont like gear oil at all:mad:
     
  5. sr175

    sr175 Registered Member

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    Mine does the same thing. Dont mix oils as the last post says. Its a bad seal on the rear of tranny.
     
  6. sweetk30

    sweetk30 professional hooker Premium Member

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    oh ya when i had to get seals all the books said this 3 but when i went to install them thay were wrong. for some reason i had to use 2 203 input seals as mine setup was a 2 seal unit. just keep a eye out for that one buddy.
     
  7. sr175

    sr175 Registered Member

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    i had trouble myself getting those seals at local parts store. Had to find alternative seal. I guess it didn't work! Oh well it lasted a year and a half!
     
  8. blackblazer717

    blackblazer717 1/2 ton status

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    mines doing the same thing too. damn thing!
    but mines a 700 and 208
     
  9. wazzabie

    wazzabie 1/2 ton status Premium Member

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    I've been running a np205 which had ATF fluid in it before I bought it. I swaped it out for gear fluid. It runs great.. My concern was that gear fluid would get into the tranny ATF fluid. However the tranny fluid has more presure the the transfer case. So it may not be a best practice but I think np205 would run on ATF fluid and you could get by.
     
  10. Jonny-K5

    Jonny-K5 1/2 ton status

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    mine does the same thing too. i have the seal, but im too lazy/busy to drop the Tcase to replace it.
     
  11. ecameron87

    ecameron87 1/2 ton status

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    Luckily I am running tranny fluid in my NP205. It only leaks at highway speeds. I wish that I could just plug up the vent hole on the transfer case, then it wouldn't leak right? What would that do? :D
     

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