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Originally Posted by JoulesWinfield
Thanks again. I will pull up some information that I have at home to see if I can get a better understanding.
I did just read an old post from Blazee, where he said the t-case does nothing for 4hi selection so Im kinda confused. Would I get any kinda code if the switch was bad? Im thinking maybe its not reading the proper position for Hi vs low.
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That's the way the system is described to work in the manuals that I read. It stated that the actuator on the diff is used to change from 2wd to 4wd, and that the encoder motor was used solely to change from high range to low range. It stated that transfer case was direct driven and supplied power to the front diff at all times.
From my experience with the system, I don't believe that the manual description is correct. I think that the system operates similar (if not exactly) as blazes9395 states. The main reason I think that the info I read was wrong is because when in 2wd, the front drive shaft can be easily turned by hand.... if it were tied directly to the rear driveshaft then you would not be able to turn it, so something in the transfer case must engage it. I have rebuilt a ton transfer cases, but never the type used in these vehicles, so I can't say with 100% certainty the exact internal operations.