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T-Case Lubricant

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by wfo163, Apr 17, 2003.

  1. wfo163

    wfo163 1/2 ton status

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    This may seem like an arbitrary question but I am in the process of repacking my np 205 with all new seals and gaskets and was curious if refilling this thing with gear oil instead of ATF is permissable. I cant imagine why it would be bad for the all gear drive rather I think it would be beneficial as it seems to me that ATF is just to thin of a fluid for a transfer case. Any input is appreciated. Keep on wheelin'!
     
  2. Hossbaby50

    Hossbaby50 3/4 ton status

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    I think 205's are supposed to be filled with gear oil. If i remember right the 203's and 205's take gear oil. 208's and 241's take ATF.
     
  3. heavy4x4

    heavy4x4 1/2 ton status

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    That's what I was thinking too. /forums/images/graemlins/thumb.gif
     
  4. SUBFAN

    SUBFAN 1/2 ton status

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    I THOUGHT MY OLD 203 WANTED ENGINE OIL, BETTER CHECK....
     
  5. 74Chev

    74Chev 1/2 ton status

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    This is what the factory calls for and were factory filled with.
    NP 203: 10w-30wt. motor oil
    NP 205: 80w-90 gear (Canadian vehicles and colder climates call for 80w or 75w-90)
    NP 208 and NP 241: ATF Type Dexron

    I do know that Dodge in the 1980's called for ATF in the 205's that were available in their heavy duty trucks, probably to help increase gas mileage due to federal regulations concerning Corporate Average Fuel Economy.
     
  6. Poohbair

    Poohbair 1/2 ton status

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    Don't put gear oil in your 203...they don't like it. I have seen people run ATF in 205's w/ OK results...but I would stick to the gear oil in the 205's.
     
  7. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    [ QUOTE ]
    Don't put gear oil in your 203...they don't like it. I have seen people run ATF in 205's w/ OK results...but I would stick to the gear oil in the 205's.

    [/ QUOTE ]
    WHere it's real cold people will run ATF in the case in the winter.
     
  8. rcpilot

    rcpilot 1/2 ton status

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    My shop that rebuilt my 203 put gear oil into it... I asked them about the oil slinger and when it was apart they showed me it had no slinger and said that the upper was lubed by the chain slinging it...I believe thats why I have to lock the hubs every 200 miles as recommended by Mile Marker...
     
  9. Executioner

    Executioner 1/2 ton status

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    Please tell us the shop name and location.
     
  10. rcpilot

    rcpilot 1/2 ton status

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    Summit Transmission in El Cajon, CA
     
  11. BowtieRed

    BowtieRed 1/2 ton status Author

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    motor oil in a 203 from what i've heard, gear oil in a 205, ant ATF in a 208
     

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