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4 Wheel drive maintenance...

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by MrBob, Aug 7, 2000.

  1. MrBob

    MrBob Registered Member

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    OK fellows.... what can I do to just inspect and do some basic maintenance on the transfer cases. How do I make sure they are working ok and how do I change ( or do I need to) the transfer case oil and what do I use. the chiltons only tells you how to rebuild it. I don't wanna do that I just want to look it over and see if there is anything i should be aware of before we try it out. We just bought this thing and were told the 4 WD works fine. How do we check it (other than the obvious "Stick it in 4 WD and try it, dummy" answer.)

    Anyone ever notice that $ is right above the 4 key so that it's easy to write "$ Wheel Drive"? kinda ironic eh....? must be a premonition....

    Red Springs, N.C.
    "I ain't responsible for my crappy typin' or spellin'"
     
  2. Boss

    Boss 1/2 ton status Author

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    Obviously the easiest way is to stick it in 4WD and try it out. Unless you want to take it out and then look at it, but that aint really worth it unless you're ready to rebuild it. One thing you could try is put the transfer case in 4hi or lo, and then go under your truck (while its off) and see if you can turn the front drive shaft. If you can't, then that's a good thing. Means your 4wd is engaged. If you can, then no good, means its not engaged. Oh, make sure that when it is in 2hi, the front drive shaft can spin freely. Depending if you have manual locking hubs or not, but if it is manual, now lock the hubs. See if you can turn the axle (next to the front disk brakes) If you can't, then good, its locked. Now take it for a spin. When disengaging, unlock the hubs and then put in 2 hi. Should reverse for a little bit to get it out. Then drive. After you park it, check to see if you can turn the drive shaft and the axle. Should be able to. Then you know your system is all good.
    For routinely maintenance, (if you don't wheel often) you should drive it in 4WD for atleast 1 mile once a month to get the fluids going. (atleast that is what the manual says).
    Fluid: Depending on your transfercase, If you have a:
    NP203-then use motor oil.
    NP205-then use Gear oil, 80W/90W.
    NP208-then use ATF fluid "Dexron III"
    Boss
     
  3. MrBob

    MrBob Registered Member

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    thank you Boss...very helpful, Appreciate it!

    Red Springs, N.C.
    "I ain't responsible for my crappy typin' or spellin'"
     
  4. MrBob

    MrBob Registered Member

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    Ohhhhh...BTW...How do I know which tranfer case I have?? Is it stamped on it or will it say in the owners manual?

    Red Springs, N.C.
    "I ain't responsible for my crappy typin' or spellin'"
     
  5. Emmettology 101

    Emmettology 101 3/4 ton status

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    Determining what t-case you have isn't very hard.

    First what year is your Blazer?

    That will be a starting point.

    Mike [​IMG]
    1982 GMC Jimmy - <font color=green>Emmett</font color=green>
    http://emmett.coloradok5.com
     
  6. 90K5

    90K5 1/2 ton status

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    There should be a round tag with on the back that says what kindit it. Do you use Dexron III for an NP 241 also?

    90K5
     
  7. MrBob

    MrBob Registered Member

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    Ours is an '86 with a 305 engine and automatic tranny, K-5 Big Boy

    Red Springs, N.C.
    "I ain't responsible for my crappy typin' or spellin'"
     
  8. Emmettology 101

    Emmettology 101 3/4 ton status

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    Then your t-case should be an NP 208, if it is the same unit that was in there from the factory.
    This t-case has aluminum cases and is chain driven. It has a low range ratio of 2.61:1 .......

    Need anymore info?

    Mike [​IMG]
    1982 GMC Jimmy - <font color=green>Emmett</font color=green>
    http://emmett.coloradok5.com
     
  9. Emmettology 101

    Emmettology 101 3/4 ton status

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    What do you mean by "K5 Big Boy"? or was that just an expression?

    Mike [​IMG]
    1982 GMC Jimmy - <font color=green>Emmett</font color=green>
    http://emmett.coloradok5.com
     
  10. Boss

    Boss 1/2 ton status Author

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    Emmet is right, NP208 is your transfercase, so use Dexron III for the fluid. Same as the NP241, 90K5, use Dexron III. They are both chain driven with aluminum housing. NP203 is the only chain driven that requires motor oil. Hope this helps yah, any more q's, let me know.
    Boss
     
  11. MrBob

    MrBob Registered Member

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    just an expression...did I offend , or confuse someone with that term? I just meant we gotta big Blazer instead of a little Blazer. Now ya'll gimme a break here I'm new at this Blazer stuff, Hear? [​IMG]

    Red Springs, N.C.
    "I ain't responsible for my crappy typin' or spellin'"
     
  12. Emmettology 101

    Emmettology 101 3/4 ton status

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    No offense or confusion, just wondered what you meant. :)

    Mike [​IMG]
    1982 GMC Jimmy - <font color=green>Emmett</font color=green>
    http://emmett.coloradok5.com
     

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