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NP203 suddenly making noise

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BorregoK5, Sep 26, 2001.

  1. BorregoK5

    BorregoK5 1/2 ton status

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    Is this a plague or what, today after climbing a hill my np203 started making a ticking noise when moving that I can feel in the shift lever. I dropped underneath to make sure it wasn't a u-joint or anything else and its officially from inside the case. It would tick faster with speed proportional to the speed in any position LLOC-L-H-HLOC and didn't go away untill I unlocked the front hubs. Does this sound familiar to anyone, I'm thinking its a bearing sound as opposed to a loose chain sound as its not a random tick but holds a good rythm with the speed of the vehicle. Should I be looking at a better transfer case anyhow, perhaps a stronger one?

    What, Me Worry?
    <P ID="edit"><FONT class="small">Edited by BorregoK5 on 09/26/01 03:23 PM.</FONT></P>
     
  2. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    203 is a good case and only one case stronger...the 205. My guess is either you blew a U-Joint in the CV or the part time kit is not installed correctly. Get under it and push in and pull out on the yoke. if it has noticable play then there is your problems. The tail shaft is not shimmed correctly. The tail shaft should have only 1-2 thousands endplay. If you got that crappy Superlift part time kit that's the rest of your problem. Get a Mile Marker kit. Even the cheap MM kit is better than the Superlift kit. The other possiblility is the thrust bearing that you have to install with the part time kit ate it and that will also put in excessive play.
    Chains jump and them make a pop or a bang when they do and only under heavy load.

    I don't need no damn shop manual, I got a pornographic memory.
    <a target="_blank" href=http://communities.msn.com/OffroadK5s>communities.msn.com/OffroadK5s</a>
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    Grim-Reaper
     
  3. BorregoK5

    BorregoK5 1/2 ton status

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    I've been looking into a 205 as I want to get a 700r4, I'm scouting the junk yards every few days. I checked all the U-Joints and they are fine, relatively new too. I don't have a part time kit, I unlock the front hubs and let the driveshaft spin free. I noticed today that it makes no noise when its cold but after a few blocks starts to tick again with speed, 4 low is louder. Definately most evident under load but after warm up, it ticks constantly getting louder under load. Perhaps it is chain related but it sounds just like a bad u-joint. In fact, just like a front wheel drive vehicle under a hard turn with a bad front cv-joint. A thumping tick sound.

    What, Me Worry?
    <a target="_blank" href=http://www.echobit.com:81/k5/> The 'BEFORE' pictures</a>
     

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