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np205tc ?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by NoShow84, Oct 26, 2002.

  1. NoShow84

    NoShow84 Registered Member

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    i just put a 205tc in my 84 k5 with a slip yoke. as i am changing out the fliud i noticed it was tranny fluid and i always thought that the 205 took gear oil is this true or did some take tranny fliud /forums/images/graemlins/confused.gif
     
  2. TX Mudder

    TX Mudder 1/2 ton status

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    205's that are connected to manual transmissions use gear oil. 205's that are connected to autos use ATF.
    Why? Because if the seal between those two leaks (and they commonly do) then you are not mixing two dissimilar fluids.
    There ya go.
    -- Mike
     
  3. u2slow

    u2slow 1/2 ton status

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    When I changed the tranny/t-case oil in my crewcab (SM465/NP205) the first time, ATF came out - I nearly had a heart attack! /forums/images/graemlins/eek.gif

    The shop I worked at had AllData, and ATF IS the correct fluid for the 465 and 205. Called GM to verify - same thing - ATF. /forums/images/graemlins/confused.gif

    Since I know better (/forums/images/graemlins/grin.gif) 80W-90 went in instead. Its quieter, and nicer to shift now. Go figure. /forums/images/graemlins/rolleyes.gif
     
  4. GMCLegacy

    GMCLegacy 1/2 ton status

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    According to Chilton section 1-28...

    A 205 TC would require SAE 80W or SAW 80W-90 GL-5 Lubricant

    A 203 TC would require SAE 10W-30 or SAE 10W40 engine oil

    A 208 TC would require Dextron II

    According to Chilton, you are supose to refer to your owners manual for K30/35 models

    I have always put 80W-90 in my 205's since it is gear driven just as a SM465. The 203 and 208 TC both are chain driven, so the requirements are different.

    just my $.02
     
  5. TX Mudder

    TX Mudder 1/2 ton status

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    Hmm, that's very odd.

    I use gear oil in my 465 / 205.

    Interesting, but odd.
    -- Mike
     
  6. m j

    m j 1/2 ton status

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    you trust a Chilton's manual?
    in the 80s chev specd auto tranny fluid to reduce parasitic losses
     
  7. imiceman44

    imiceman44 1 ton status

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    I trust chilton only when it seems logical.
    I always have my opinion and usually want a second opinion so when we agree I trust them /forums/images/graemlins/smile.gif
     
  8. GMCLegacy

    GMCLegacy 1/2 ton status

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    in 80's the 205 TC didnt exsist. with the exception of the K30's
     
  9. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Incorrect at least for 1980 (imfamous year of slip yoked 205's on everything...K5, K10, K20, and K30). Years after it was mostly K30's that had them, but some K20's as well.
     
  10. beater74

    beater74 1/2 ton status

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    </font><blockquote><font class="small">In reply to:</font><hr />
    in 80's the 205 TC didnt exsist.

    [/ QUOTE ]
    jeeze, you are way wrong /forums/images/graemlins/grin.gif /forums/images/graemlins/eek.gif
     

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