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HELP finding Xcase seals

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by arq, Mar 5, 2002.

  1. arq

    arq 1/2 ton status

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    anyone know where i can pick these up, local parts store guy don't know whata Xcase adapter is. they are the seals that go in the Xcase adapter for a th350/np205 or sm465/np205, i actually need one of each. part numbers would be helpful.

    thanks,

    ARQ.
     
  2. wayne

    wayne 3/4 ton status

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    Call ORD, they should be able to hook you up.
     
  3. ftn96

    ftn96 1/2 ton status

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    You dont need a seal btween the the Xfer case and the adapter. There is a gasket that goes in there. But I have always used RTV without any troubles what so ever.
    So Im a little confussed as to what you are referring to as far as what seals you are talking about.
     
  4. arq

    arq 1/2 ton status

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    I'm talking about the seals that go inside the Xcase ADAPTER. I got some part numbers.

    For the th350/np205 ADAPTER
    2 - National 471424
    1 - O-ring, still need the size

    For the sm465/np205 ADAPTER
    1 - National 3968050

    can anyone look these up??

    forgot to add, the seals in the ADAPTER, keep the oils from mixing. especialy if you are using tranny fluid(hydrolic) for the auto and gear oil for the Xcase.

    ARQ.
     
  5. m j

    m j 1/2 ton status

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    so the parts counter couldnt order you National seals with a part #?
    my 465/205 uses a
    National 473214 - 1.375 x 2.25 x .312
    your number could be the chev OEM number i guess
     
  6. mike reeh

    mike reeh 1/2 ton status

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    i just went thru this.. my dealer stocked em for $25 a peice, but I ended up ordering CR brand thru Kragens... You have to either use the computer yourself or find someone halfway competent.. but good luck

    why do you need one of each, anyway?

    mike
     
  7. arq

    arq 1/2 ton status

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    i found them for around 6-7 each, i need one for my sm465(mine) and the other for a th350(for a friend).
    Thanks for the part number i'll write it down just in case.

    ARQ.
     
  8. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    There should be two seals in each adaptor (or at least the 350 one as I have never seen the 465 one) they both sit in the adaptor and ride on the coupler (you should see two rings where the old ones rode on the coupler). One to keep the tranny fluid in the tranny and one to keep the t-case fluid in the t-case. In the middle is a no man's land so I usually grease the coupler and seals real good.
     
  9. mike reeh

    mike reeh 1/2 ton status

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    no mans land LOL
     
  10. Russell Keys

    Russell Keys 1/2 ton status

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    not trying to disagree, but when I had my th350 amd np203 apart the only thing that was in the adapter was an flat o-ring that faced the tranny. As for the t-case there was an input shaft seal I replaced and a gasket that goes between the mating surfaces of the adapter and the t-case that i applied a thin film of silicone to. I guess it may differ from year models?
     

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