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NP203 gear oil

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by rcpilot, Mar 21, 2002.

  1. rcpilot

    rcpilot 1/2 ton status

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    Help.. my '76 K-5 has a part-time kit installed.. original owner does not recall what type/brand of a part-time kit he installed.. been many years.. Mile Marker kits call for 10W40 motor oil.. I want to drain and refill the T-case.. what should I use.. Thanks...
     
  2. Blazer79

    Blazer79 1/2 ton status

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    10W30 engine oil should be fine. Just drive it in 4wd every once in a while (not on pavement) to lube the front mechanisms.
     
  3. POWERMAD

    POWERMAD 1/2 ton status

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    Actualy it is to get the lube to the rear output bearing.
    If you don't lock it in 4loc/hi it everyonce in awile the pump never lubes the rear output shaft bearing.
     
  4. zakk

    zakk 1/2 ton status

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    i used 20w50 oil and it hasn't blown up yet/forums/images/icons/laugh.gif
     
  5. weisel

    weisel 1/2 ton status

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    I would use strait 30 weight non- detergent. But I have heard of people putting everything in them.. atf. gear oil. ect. and haven't heard about it hurting them. but i would stick with the 30 weight.
     
  6. rcpilot

    rcpilot 1/2 ton status

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    Thanks... I read on mile-markers web site that I should lock the hubs and drive approx. 10 miles a month to throw oil up into the rear housing.. they didn't say that I needed to actually put into 4WD though.. the original owner never did this and doesn't recall having to do it... no noises and it runs great though... again thanks
     

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