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  1. #1
    Jr. Apprentice smitht65's Avatar
    Join Date
    Oct 2010
    Yellowknife NT, Canada

    Default Transfer Case Troubles in My Suburban

    Hey, Since I bought "Mud Chukker" I have had problems going through the transfer case gears... For one, I have to make sure the truck is moving before I even attempt to switch between lo and hi 2 or 4, It seems to go into and out of 4-hi 2-hi not too badly, however after the truck is in 4-lo its really difficult to get it back into 2-hi, most of the time I have to go to 4-hi and then back up to 2-hi, even that is difficult, the stick will shift into the proper spot (or so it seems) but when you put the Truck in Drive again, you get nothing, and if you try to pull the t-case shifter back down you get grinding of some sort... if you fiddle with it enough it will go (so far) but Im just worried that one of these days it will leave me stranded somewhere, Whats the problem??????????

    ---------- Post added at 11:05 PM ---------- Previous post was at 11:00 PM ----------

    There is an NP-203 T-Case in the Truck.
    1977 Chevy Suburban K-20 4X4

  2. #2


    Sure it's a 203? Shift pattern sounds more like a 205. Plus, 203's don't really have a 2wd setting.
    When you hear hoofbeats, look for horses not zebras.

  3. #3
    Jr. Apprentice smitht65's Avatar
    Join Date
    Oct 2010
    Yellowknife NT, Canada

    Default T-Case

    Yea its a 203, I put a mile marker conversion kit in it so I can take it in and out of 4x4
    thats why I said it has 2 hi and 2 lo, but really the case has lo-loc,lo, N, hi, hi-loc
    Thats what the gears look like.

  4. #4


    How often do you run it in 4wd? I don't know all the details, but the 203 depends on the front output shaft for lubrication. Many guys that do the conversion take off in 4wd every morning and drive for a mile or two before going back to 2wd. I would try changing the fluid to synthetic and see if that helps.

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