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1975 Blazer Transfer Case

Discussion in 'The Garage' started by LovesDunes, Nov 7, 2005.

  1. LovesDunes

    LovesDunes Registered Member

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    Hi Everyone. Here is an easy question. I just purchased a 1975 Blazer. The transfer case shifter knob offers no explanation on what is what. Can you guys tell me what all the way forward is. 4 Lo? 4 Hi? I played around with it this weekend but did not seem to learn anything other than it can sure make some scary noises. I'm going to go buy a manual on the way home tonight to learn some more. Do I need to be in neutral to get it back to 2x? Or into 4 Lo? Or park? I kept having to turn the truck off to put it back in 2x. With the truck running and I put it or try to put it in park all kinds of grinding noises were going on. Has nice looking warn hubs up front. I got lots of exercise hopping out turning those things.
     
  2. Cricket

    Cricket 3/4 ton status

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    It should be a NP203 chain drive or NP205 gear drive transfer case.

    203 pattern from firewall toward seat is: Low-loc, Low, Neutral, Hi, Hi-loc.

    205 should be 4-Low, Neutral, 2-High, 4-High.
     
  3. odoa3

    odoa3 1/2 ton status

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    I have a '75 as well. It came with a 203. I have a 205 knob on mine, great to confuse people. :haha: You do have to have the transmission in neutral to shift the t-case. If the t-case is out of adjustment a little it will make it hard to shift- lots of bad noises! :eek1: Good luck!
     
  4. supernaut

    supernaut Registered Member

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    If it has a NP203 then the locking hubs may indicate that it has a part time kit in it, or that they were put in in anticipation of a part time kit. here is shift pattern info for with and without part time kits installed on a NP203. This info does not apply if you have the superman NP205.

    HERE is a link to the milemarker reviews on this site where I took this quote

    there should be a metal tag on your transfer case that will plainly state what it is. My NP203 in my '75 K5 has the tag on the front side of the t-case above and a little to the left of the front drive shaft yoke. grab a rag and a flashlight. once you wipe it off it should be shiny metal/colored (mine is shiny metal and blue) and easily distinguishable from the rest of the dull grey/mud color of your t-case.
     
  5. LovesDunes

    LovesDunes Registered Member

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    Thanks guys. I will crawl under it when I can and check out what I have. So back in the day you could actually shift the transfer case into low and still be in 2 wheel drive? That is cool. I wish my F-350 would do that for moving my big ole trailer around.

    Here is a picture of the Blazer out in Glamis before we hit the bigger dunes.

    [​IMG]
     
  6. 75GmcJimmy4x4

    75GmcJimmy4x4 1/2 ton status

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    im having the same problem with my 75 jimmy i think im just a newb or something ......... shifting a transfer case shouldn't be brain surgery
     

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