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EMERGENCY!!HELP!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by txfireman110, Dec 22, 2003.

  1. txfireman110

    txfireman110 1/2 ton status

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    I'm changing out my t-case adapter (old one sheared off) and as I was taking bolts out, transmission fluid started coming out of a bolt hole. /forums/images/graemlins/shocked.gif I then pulled the drain plug on my t-case(NP205) and TRANSMISSION FLUID POURED OUT! Please tell me that im wrong, but isnt that supposed to be 90weight??? NEED HELP ASAP!!!! /forums/images/graemlins/ears.gif
     
  2. Muddytazz

    Muddytazz 1 ton status

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    Sounds like the seal was leaking /forums/images/graemlins/shocked.gif
     
  3. txfireman110

    txfireman110 1/2 ton status

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    That's what I am figuring, the BIG ? is, is this a big deal, or can I just drain it and put new seals in and go on about my business.
     
  4. Muddytazz

    Muddytazz 1 ton status

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    I'm no expert on a 205 since i've only owned a 203, but I would think that all you need to do is drain it good and replace seal(s).
     
  5. txfireman110

    txfireman110 1/2 ton status

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  6. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Some late 205s came with trans fluid in them...
     
  7. Muddytazz

    Muddytazz 1 ton status

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    /forums/images/graemlins/thinking.gif thats good info to know
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    But this particular one is in a '80 truck...ATF in a 205 didn't start til middle to late 80's?

    Rene
     
  9. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    [ QUOTE ]
    But this particular one is in a '80 truck...ATF in a 205 didn't start til middle to late 80's?

    Rene

    [/ QUOTE ]

    You are correct /forums/images/graemlins/thumb.gif (at least from the factory), but many "techs" replaced the gear oil with ATF as they figured if that is what the factory changed to, they should too. My 80 was that way when I bought it (filled with ATF), and after a complete rebuild, I switched to 90 weight.

    It doesn't mean that the seals weren't leaking (as after this many years they probably are). You should check the drivesleeve for grooves cut into it by the old seals and replace if necessary (under $100), as well as the seals in the adapter, and O-ring seal around the tranny output housing. It might cost a little $, but taking the 205 back out again would suck too. Plus if you get another 23 years out of the seals it is a cheap investment. Either way I would refill with 90 weight.
     
  10. txfireman110

    txfireman110 1/2 ton status

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    Thanks for all the replies guys!

    I also consulted a local tranny/4x4 guru and he confirmed that it was supposed to have 90weight. Fortunately, he stated NO BIG DEAL, Drain it and replace the seals!

    Thanks again! /forums/images/graemlins/thumb.gif
     
  11. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    In cold climates it's not uncommon to run ATF because the gear oil is like molasses.
     
  12. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Good point! I saw he was from Texas so I didn't even think to mention that.
    I also think using synthetic gear oil in moderately cold climates would work best, unless you live in Siberia or Northern Canadian provinces /forums/images/graemlins/cool.gif /forums/images/graemlins/thumb.gif
     
  13. monte0172

    monte0172 1/2 ton status

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    Actually if you read the original manual it says to use 10w30 motor oil. Gear oil is too thick and trans fluid is to thin.
     
  14. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Actually 10W-30 is recommended for the NP203 as gear oil is too thick to properly lubricate the chain, but for a NP205 gear oil was factory installed in the 70's, then the factory started using ATF. Nowhere have I seen 10W-30 recommended for the 205 in any manual, although 10W-30 would work better than nothing at all.
     
  15. JK5

    JK5 1/2 ton status GMOTM Winner

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    I've always put ATF in my 205's...
    and NEVER had a problem.. /forums/images/graemlins/thumb.gif

    I scrapped a 80'K5 last year...
    I found ATF in the 205... /forums/images/graemlins/wink.gif
     

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