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  #16 (permalink)  
Old 04-03-2006, 04:00 PM
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THIS JUST IN

today after work me and my bossman tinkered around with it cause i wanted to show him the new noise it was making. so anyway i went to put it in 4 low to show him and i guess i put it in 2 high by accident and the front driveshaft no longer spins so maybe i had it in 4 high before, but that wouldn't explain why i could turn the driveshaft by hand before. i dunno

so this is what i came to conclude starting all the way forward is 4 low, 2 high, neutral, then 4 high all the way back. and as for it being a 203, i guess it has to be since i found the tag on it with the model and serial number. it says 203 stamped right on the tag

but this thread {i think} has alot of good useful information i'll still use. thanx everyone

later, J

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Old 04-04-2006, 11:21 AM
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Sound as if the part time kit has been installed.
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Old 04-04-2006, 02:38 PM
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205 has no 2lo and also has shift rods hooked straight to the shifter, not linkage rods like a 203
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Old 04-04-2006, 05:14 PM
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ok i'm offically lost now!

today i pulled out the driveshaft to check it out b/c of this new noise it's making and it checked o.k. so i put it back in and took it for a test drive and i started in what i know is 4low cause thats what gear it usaully makes the noise in and it still did it so i put in what i thaught was 2wd and the front driveshaft spins, but it didn't spin the other day but then again the other day i was just movinmg it around in the driveway as for today i was going down the road. think that might make a difference some how???

J
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Old 04-04-2006, 06:40 PM
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If you've got a digital camera you should take several pictures of the transfer case and post them. Somebody can identify what it is for you and should be able to tell you exactly what shift pattern it has.

As far as noise goes, the 205 is a gear driven unit and might make some gear whine when it's in 4wd. If thats what it turns out you have.

Does the rear driveshaft use a slip yoke or does the u-joint bolt to the yoke on the transfer case?

Also, does your Blazer have automatic locking hubs or manual hubs?
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Old 04-04-2006, 07:22 PM
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well i found the tag on the transfer case the other day and it's stamped right on the tag "203" then it has the serial #'s and such

the new noice is like a loud metal clicking noise (if that makes any sense) it kinda sounds like the front driveshaft is jumping teeth inside the yoke but i checked it out today and it's fine. i'm thinking it might be in the front output shaft in the transfer case maybe.

the rear drivshaft has a slip yoke and it has manual locking hubs, but i don't think something is right about the whole set-up b/c i was under the truck droping the front driveshaft and the tranfer case was in some gear and i reach around the tire and locked the hub so i could break the bolts free and the freaking thing turned it would't stay still so i reached around the other tire and locked the other hub too thinking maybe i might have to lock em both to keep the axle from spinning so i could break them flippng bolts free and it still spun, i ended up crawling out from under truck and putting it in what i know is 4L to keep the driveshaft from spinning so i could break them bolts loose

does that make sense to you?

J
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Old 04-04-2006, 07:54 PM
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Ok, I remember you mentioning it's a 203 now. If you havent found out already, NP203 is a full time 4wd transfer case. In factory form the shift pattern is HI-LOC, HI, N, LO, LO-LOC. The case has an internal differential much like you would find in a front or rear axle. In hi or lo the differential acts normally, having the ability to put power to any of the tires the same way an open differential in a front or rear axle works. It is possible to be in low range without the differential in the t-case being locked.

In order to lock the front driveshaft from spinning the shifter needs to be in the hi-loc or low-loc position.

If the front axle still has an open differential it is still possible to spin the front driveshaft if only one hub is locked in. The shaft will just spin the other axle. When you locked the second hub how far did you try to spin the driveshaft? The hubs should hold the driveshaft but it might take a small amount of revolution to engage the hubs. --I'm not totally sure though as I've never tried to lock the hubs and turn the driveshaft by hand. I've always just locked it in 4.-- If it does, it should take less than a turn.

If the transfer case has been converted to part time 4wd then the shift pattern will be 4HI, 2HI, N, 2LO, 4LO. If this has been done you need to run it in 4wd every once in a while to make sure everything gets lubed properly.

You should read this: New Process 203 A friend of mine had a GMC pickup with a NP203 that had this done. It talks about the proper lube to be used in the t-case, problems you might run into and converting it to part time. Good piece of information.

Last edited by Blazin72; 04-04-2006 at 08:08 PM.
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