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T-case identification(help please)

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by cleanK5, Dec 10, 2005.

  1. cleanK5

    cleanK5 Registered Member

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    Ok, I'm trying to ID my t-case and it's been 6 years since I've owned a GM.

    I've got a th350 in my 72 4x K5. The transfer case is cast iron with aluminum covers.... is this a 205?

    Also, that would mean it's got a chain, not all gears correct? What should I be running for lube? It's leaking dex3 from the speedo cable hole, which had me worried until I remembered that it's not a Toyota:doah:(I sold my 4th toy truck to get the K5)


    Any help for the newbie would be appreciated:wink1:

    -Luke
     
  2. Muddytazz

    Muddytazz 1 ton status

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    203's are chain driven, 205's are gear driven, there should be a TAG plate on the tcase somewhere
     
  3. cleanK5

    cleanK5 Registered Member

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    cool, I'll crawl around and try to find it later.

    any idea on the fluids? I would assume gear lube in the 205, and dex3 in the 203 because of the chain...
     
  4. Muddytazz

    Muddytazz 1 ton status

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    no no no on the dex3....203's get 30w motor oil only and your correct on the gear lube for the 205
     
  5. RustyParts

    RustyParts 1/2 ton status

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    Tag should be on backside of transfer case (towards rear driveshaft) blue and white in color, unless someone rebuilt it and didn't put it back on.

    Probably a 205.

    DCP_3059.jpg
     
  6. DEMON44

    DEMON44 Low-Tech Redneck

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    [​IMG]


    On the Left 203 on the right 205.

    The rear of any 205 will have a silver dollar sized cover plate with 3 bolts holding it on, right in the middle. Thats the rear support for the idler.

    203 has a whole range box hanging on the front.
     
  7. DEMON44

    DEMON44 Low-Tech Redneck

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    [​IMG]I found a better shot on one of my other 205s, thats the small 3 bolt plate on the ass of every 205.
     
  8. cleanK5

    cleanK5 Registered Member

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    yup, it's a 205.

    thanks very much for all the help guys. this site is awesome!!
     

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