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Transfer case question

Discussion in 'The Garage' started by Z3PR, Apr 11, 2002.

  1. Z3PR

    Z3PR Banned

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    I don't know much about 4x4's. I just recently bought a 76 K/5 Blazer. It is all factory original. It's got the 400/400 combo. What transfer case would it have ??? It's full time 4 wheel drive. Also, what all would be involved in converting it to part time. Right now I've got (high, high-lock, low, low-lock). Would you recomened this conversion ??? This is my daily driver that see's alot of street and highway use. I do plan on off roading with it.
     
  2. fortcollinsram

    fortcollinsram 1/2 ton status

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    That would be a New Process (NP) 203...It has a cast iron case, is chain driven and had a 2.00:1 lowrange...As you stated, it IS a full time t-case...I think MileMarker or somebody like that has a kit for around $100 to convert it to a part time t-case...

    Chris
     
  3. weisel

    weisel 1/2 ton status

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    fortcollinsram is right, that is a np203. But about recomending the part time kit or not? I don't know. Some people swear by them but I personaly have ran full time for some time, after getting rid of my part time case. I didn't see any better gas mileage with the part time and am not going to convert mine.
     
  4. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I never heard of a 400 tranny in a Blazer. Only in the 3/4 ton trucks.

    I also never heard of a 400 tranny back in '76 models. I thought TH400's came out in the trucks in '77.

    Don't take my word for all this info though. /forums/images/icons/tongue.gif
     
  5. Hossbaby50

    Hossbaby50 3/4 ton status

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    That is what I was thinking too. I was thinking it should be a th350. I may be way off base though.
     
  6. thatK30guy

    thatK30guy 1 ton status Premium Member

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    If that tranny is the 400, then I would almost bet that someone else swapped it in there.
     
  7. Z3PR

    Z3PR Banned

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    It may be a th350, I was assuming it's a th400, but I may be wrong. I'll have to climb under it and have a look. I'll do a follow up post in a few mins. Let me go look.
     
  8. zakk

    zakk 1/2 ton status

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    if it looks like a square with one cornor lopped off, its a TH350
     
  9. Hossbaby50

    Hossbaby50 3/4 ton status

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    the pan that is.

    Also if the pan looks like Texas then it is a 400.
     
  10. Z3PR

    Z3PR Banned

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    I just climbed under the Blazer. It's a th350.
     
  11. Z3PR

    Z3PR Banned

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    What all would be involved in installing the part time kit ??? Or should I have a shop do it ???
     
  12. 70jimmy

    70jimmy 3/4 ton status Premium Member GMOTM Winner

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    I had a 74 K5 with 400/350/203 with full time. It worked great, I ran it for four years. It did bind a little on tight corners. I did finally break the left front axle shaft just going down the highway but I think it was from some jumping I did with it prior.

    I had planned on doing the swap to part time and back then it could be done for about $200.00 installed. It involves obviously new locking hubs and then there is a part that has to be installed in the transfer case.

    As soon as I bought mine I put a modified 400 in it and smoked the tranny so upgraded tranny and had the chain and seals and what ever else looked bad on the transfer case done.
     
  13. Z3PR

    Z3PR Banned

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    Is this something that anyone can do in the driveway, or is it best taken to the shop ??? I've never done this type of conversion befor.
     
  14. Z3PR

    Z3PR Banned

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    I'm also consittering getting a doubler from ORD. I just need to have a rich relative keel over and leave me some mulla.
     
  15. gtkustoms

    gtkustoms 1/2 ton status

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    thatk30guy

    turbo 400 were available in 75 my grandpa ordered it from the dealer that way btw its a 3/4t 4x4 with np203
     

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