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NP203 with part time kit and other info

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Junior_Fangler, Mar 30, 2001.

  1. Junior_Fangler

    Junior_Fangler Registered Member

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    I have a 77 Blazer with a part time kit in the NP203. It was there when I bought the truck so I don't have a clue to it's function.

    Does the part time kit eliminate the center diff? Or can I still drive in 4HI on asphalt and other non-slip surfaces?

    Also, how much torque was the NP203 rated for from the factory? Who sells rebuild kits, or remanufactured 203's?

    Thanks for your help,

    Newbie to the forums
     
  2. HarryH3

    HarryH3 1 ton status Author

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    Howdy Junior! Welcome to ColoradoK5! Click on the link just above that says "Edit Profile" and tell us a bit about yourself and your rig. [​IMG]

    The NP 203 conversion kit does indeed do away with the ability to use 4WD on pavement. It disables the internal differential and makes it possible to run in 2WD with the front hubs (added when the kit is installed) unlocked.

    I don't know the exact torque rating of the 203, but they're King Kong strong. The only thing you have to watch out for is that there's a beefy chain inside the case that drives the front output shaft. If you feel it start banging or jumping under stress, it usually means that the chain has stretched and it's jumping teeth on the drive gears. STOP using 4WD right then and you can fix it yourself for around $100 or so. Keep driving it in 4WD like that and you'll be looking at a much more expensive repair.

    There are lots of places that sell rebuild kits. I'm sure someone will jump in soon with some web sites, etc. I can't think of any off hand. There's an outfit that sells them already rebuilt at <A target="_blank" HREF=http://www.transfercases.com>http://www.transfercases.com</A> but I don't know what their reputation is.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  3. slider79blazer

    slider79blazer 1/2 ton status

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    I just bought that kit I'm putting it in tommorow. You have to have locking hubs to make it work properly. And once a week
    leave your hubs unlocked and put the shifter in 4Hi lock
    for about a mile or two, downhill if possible to oil the chain and gear in the front of the transfer case.
     
  4. Junior_Fangler

    Junior_Fangler Registered Member

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    Hi Harry, thanks for the warm welcome.

    I bought the Blazer a couple years ago and just haven't gotten around to modifying it until now. Most of my experience is with solid axle toyota's, Suzuki Samurais, and club members Jeeps.

    Now I want to play with the Blazer a little bit. I'm planning a 4" lift, rear locker, TH400 swap (Anybody have an adapter they want to sell?) :) and a few other well thought out mods. Nothing extreme, more along the lines of strength and reliability.

    I have other toys for crazy suspensions and experimentation.





    77 Blazer 350/350 NP203 FF14 D44
    Patuxent River Hard Rock Crawlers
     

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