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Np 205 fluid

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by denver75k5, Jul 30, 2001.

  1. denver75k5

    denver75k5 1/2 ton status

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    Ok , Iv'e ben told several things regarding oil for the Np205, one sais that I should use str8 80w in it and another sais to split 50/50 80w and ATF, Anyone hear of this combo????

    " Wider IS Better!!!"<a target="_blank" href=http://www.community.webshots.com/user/wheelininco>www.community.webshots.com/user/wheelininco</a>
     
  2. Boss

    Boss 1/2 ton status Author

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    I wouldn't mix. Just use gear oil.
    Boss

    89' 1 TON of FUN K5
     
  3. Pugsley

    Pugsley 1/2 ton status

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    I wouldn't mix the two - just run straight gear lube. I used to run 75W90 in my 205 with no problems.

    Generic Signature
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  4. '73 K5

    '73 K5 1/2 ton status

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    I've not heard about any mixing thing like that. I have just used straight up gear lube in my 205 as long as I've had it and that has worked just fine.

    '73 K5
    Chevy good...Ford bad
     
  5. Liberator

    Liberator 1/2 ton status

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    Use 80W 90 gear oil!
     
  6. denver75k5

    denver75k5 1/2 ton status

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    Cool, thanx for the input....

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  7. newyorkin

    newyorkin 1 ton status

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    I've heard the same, gear oil for a 205. ATF and gear lube are two totally different animals, I think it might even seriously shorten the life of the component if you mixed them...

    Do you know what was in there before? If it was ATF, everything will be sparkly, since ATF is a cleaner. If it was gear lube, it'll be kinda stinky...

    Ratch
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  8. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Where you get the ATF deal is in VERY cold climates Gear oil turns to goo .ATF doesn't. A 203 it might be more accepted due to the lubtication needs of the chain and it already running motor oil.
    Personaly before I went to ATF I would look at going to a Synthetic Gear oil that's not prone to freezing up if you live in that cold of climate.

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  9. denver75k5

    denver75k5 1/2 ton status

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    The reason I ask, is i got a 205 for my K5, and it was leaking out red oil. I asked my mechanic if they used ATF in it and his reply was " Sometimes they mix the two" but the t-case has ben sitting around for 15 years,I dont know if Gear oil changes colors? or if it's rust or what. But still a hellava deal at $20.....


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  10. prjt_blzr

    prjt_blzr 1/2 ton status

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    The early 205s ran gear oil. The newer ones ran ATF. The cutoff year is about 85. Interesting thing is that all of the parts interchange. HMMM, sounds like a MPG thing. I run 205s in two of my trucks. The K30 runs normal gear oil (it leaks too much synthetic and I don't have time to change the seals) and the other will use the goofy GM gear oil. The reason for this is that the NV4500 needs the GM fluid and I figured that if it leaks between the trans and tcase this will prevent any problems. Anyway you can run ATF but I would only run some type of gear oil as ATF is not a good lubricant.
     
  11. 84_Chevy_K10

    84_Chevy_K10 Banned

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    ATF is nothing more than 5W30 and additives. It's not a good gear lubricant but I'm sure it's a lubricant somehow if it's made from motor oil.

    I suggest gear lube in the 205.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  12. prjt_blzr

    prjt_blzr 1/2 ton status

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    ATF will lubricate. Look at the number af t-case and trans that use it. It just does not do as good of a job as a pure oil. I would not run it in my 205. Also, have seen a few instances where the local oil shops have mistakenly put ATF into an engine and then the motor is toast in a couple of hundred miles.
     
  13. dyeager535

    dyeager535 1 ton status Premium Member

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    ATF is hydraulic oil. Not sure how it is differentiated, but probably like you said, different additives and just refined a bit differently. That said, not sure why you'd want to run hydraulic fluid in a situation like a transfer case, but obviously it works : )

    Dorian
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  14. Highlander

    Highlander 1/2 ton status

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    Hey TJ
    There is a brand of gear oil that is red if i remember right that was Mystic I found it at Country General stores. But if what your smelling is ATF someone mite of put it in the transfer case to keep rust down while it sat. As for what gear oil to put in it 80-90wt is what the book calls for. Eric

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