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NP 205 gear oil or ATF?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 79Silv4x4, Jan 9, 2003.

  1. 79Silv4x4

    79Silv4x4 Registered Member

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  2. chevyfumes

    chevyfumes Court jester

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    Watch for the muzzleflash!
  3. conoverbandit

    conoverbandit 1/2 ton status

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    The guy at the chevrolet place here told my dad to use ATF only.......wonder why?
    I know the experts will chime in with a complete answer to this pondering question........ /forums/images/graemlins/wink.gif
     
  4. 74Chev

    74Chev 1/2 ton status

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    The lubrication manual specs out 80w-90 for all 205's in every make or model up until 79. I have seen some Dodge 205's spec ATF from 1980-1990. I have always used 80-90 in all 205's at my lube shop. I don't think there is any difference in the case desgin in the later model's, but the ATF spec was more of the auto manufacturers way to use a lighter wt. oil for increased fuel mileage standards. One side note, all my manuals are very explicit on filling the 205 only to within 1/2" below fill plug level or leaking can result.
     
  5. Alaska Offroad

    Alaska Offroad Registered Member

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    I use atf in my 203/205
     
  6. Shaggy

    Shaggy 3/4 ton status

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    <font color="green"> Gear oil is generally spec'ed but the things are pretty damn tough, I think you could probably run canola oil and it'd work fine. /forums/images/graemlins/thumb.gif </font color>
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    All '82 205's were slip yoke, yes?

    The '82 manual specifies Dexron II for the transfer case in one spot, not mentioning one or both specifically, but later on the manual says to check the owners manual. Guess you'd have to look in a 1980 K5 owners manual to know for sure, or any other slip yoke 205 equipped truck.

    Too lazy to even go look at my own scanned parts diagram, but I recall that the 205 had a long output for a slip yoke in '85/86.
     
  8. bigmack

    bigmack 1/2 ton status

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    My repair manual says to run 80/W90 gear oil. My truck is a '80 w/NP205 (slip yoke version).
     
  9. DieselDan

    DieselDan 1/2 ton status

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    I think I've heard this before old post /forums/images/graemlins/smirk.gif
     
  10. ken

    ken 1/2 ton status

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    My '88 crewcab's 205 uses ATF.
     
  11. m j

    m j 1/2 ton status

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    depends on the ambiant temperature.
    I run gear oil.
    but
    when I was up country and it was -40 I sure wish I had ATF or synthetic in it.

    to start the truck I had to depress clutch pedal, once the engine was running somewhat smooth I would have to feather the clutch out to break the frozen gear oil loose.
    could not have been good for the bearings etc

    lighter oil = better fuel mileage #s
     

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