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NP 203 Leaking

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mybeast, Mar 7, 2001.

  1. mybeast

    mybeast Registered Member

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    My t-case is leaking. It just started a couple of days ago. It looks like its leaking from the circular cover (Tech. Name round thingamajiggy) below and to the right of where the rear drive shaft comes out. Is this common? Is there a gasket in there, and is there anything I need to know before I remove it? Or could it be coming from somewhere else and it just looks like its coming from there.Thanks for your help

    When all else fails MASH the skinny pedal!

    www.mybeast.coloradok5.com
     
  2. Wheels

    Wheels 1/2 ton status

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    Well that could be one of two places. The output housing has two parts. The main part bolts up to the steel case and has a gasket under it. There is another part that only has an O-ring under it. The place that is just below and to the right is actually the front output shaft rear bearing housing. And yes it has a gasket under it. A complete re-seal kit for a 203 is about $25.00. Chiltons manual has a good breakdown on the 203.
     
  3. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    The cover with 6 bolts? See if the bolts are loose. That's the rear bearing cover for the front output. Most people use the bottom 2 bolts as a drain. Maybe those were left loose. If not get a few quarts of motor oil to refill. You will be draining the whole case. Problem with most gaskets is once they leak they will always leak till replaced. when you go to install the new gasket make sure it is absolutlely clean and oil free where the gasket goes. Any oil left is the start of a leak. Brake clean sprayed on a paper towel is a good way to get it oil free.
    If you didn't catch it before MOTOR OIL. Say it after me....MOTOR OIL. 203 three runs MOTOR OIL not gear oil. Same flavor you run in your engine is fine. Gear oil is too thick.

    Diging it in the dirt with my K5's
    Grim-Reaper
    <A target="_blank" HREF=http://grimsk5s.coloradok5.com/>http://grimsk5s.coloradok5.com/</A>
     
  4. mybeast

    mybeast Registered Member

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    Thanks for the info guess i'll be replacing everything to make sure I solve the problem. Thanks again.

    When all else fails MASH the skinny pedal!

    www.mybeast.coloradok5.com
     
  5. be carfull if you take that cover off. there is a bearing in there and when i took mine off-because it was leaking- all the little needle bearings fell out. i RVTed mine back on and it don't leak no mo!

    and yes- lesten to grim- motor oil. i had a shop but ATF of all things in mine! i was not happy

    78, 350/350/203, 3/4 ton, 2.5" lift, 35" BFGs
    <A target="_blank" HREF=http://bluebeast.coloradok5.com/>http://bluebeast.coloradok5.com/</A>
     

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