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transfer case

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 76GMCJimmyinAZ, Aug 1, 2000.

  1. 76GMCJimmyinAZ

    76GMCJimmyinAZ Registered Member

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    I heard someone say that a 203 t-case is aluminum, and a 205 is cast iron. Is that true? I'm trying to determine which one I have....

    Thanks

    GUZZLES GAS BUT IT'S FREE AND CLEAR!!!
     
  2. Todd78/87

    Todd78/87 1/2 ton status

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    Umm,, I "think" it's the other way around.

    Todd 78/87[​IMG]
    [​IMG]
    Alaska Bound
     
  3. Boss

    Boss 1/2 ton status Author

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    205 is Cast Iron and 203 is steel. 208 is aluminum.
    Boss
     
  4. 76GMCJimmyinAZ

    76GMCJimmyinAZ Registered Member

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    Hmmm. ok. How do I tell the difference between steel and cast? Mine has a coarse texture on the outside of the case- I would guess that it's cast?? Would the steel be smoother??

    GUZZLES GAS BUT IT'S FREE AND CLEAR!!!
     
  5. Boss

    Boss 1/2 ton status Author

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    Well, the best way you can tell if you have a 205 or a 203 is the 205 has a round plate about 3" in diameter with 3 bolts bolted through it in a triangle formation. Only the 205 has that, no other transfercase has that. There is also a plate on there that says it, but that could've been long gone through the years. Also, the 205 on the shifter says 4LO, N, 2Hi, and 4Hi (in that order). Also another one is, unless the previous owner(s) swapped out the tranny or transfer case, what kind of tranny did your truck originally come with? TH350 or 465. If it came with the auto 350, then NP203 is what you most likely would have, if it came with the manual 465, then NP205 is what you have.
    Boss
     
  6. Kyle89K5

    Kyle89K5 1/2 ton status

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    On the np 205, the dead give away is looking at the back of it. Right in the center of the rear there is a round cover about the size of a silver dollar, it has 3 bolts in it. All np205's have it and nothing else does. (thanks Depdog)

    Kyle
    89K5
     
  7. 76GMCJimmyinAZ

    76GMCJimmyinAZ Registered Member

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    Well, that answers my question! I was glancing at it yesterday, and I remember the 3-bolt cover on the back. It must have been swapped out then, if it was likely the 203 originally (TH350). Also, I do remember 4LO, N, 2HI, 4HI as being my shift pattern...

    Thanks!

    GUZZLES GAS BUT IT'S FREE AND CLEAR!!!
     

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