I recently purchased my first GMC sierra, 4.3l work truck to haul some kayaks and get me through the winter.
while driving it home i tested the 4x4 and it all worked, the 4lo was a little clunky to get into but i had no problem engaging it.
after a few miles i started hearing a clacking sound, it sounded a lot like a U-joint so i investigated when i got home and found it to be coming from the transfer case. there was a leak at the rear output shaft seal, so i replaced that and went to drain and put fresh fluid in, but to my horror there was almost nothing in there, and what came out was a black thick sludge, so i put fresh fluid in and drained it again. again what came out was better looking than before but still clearly dirty. so i finally put in another 2 quarts of dex IV that the dealer said i should be using, and have been driving it for a day or two less than 50 miles. when today noticed that the shift lever is stuck and i cant move to any of the 4x4 gears. the linkage is free i played with it and it moves around. the things that has me perplexed is that the 4x4 worked after the fluid change.
i don't know much about transfer cases, and am hoping someone with more knowledge could point me in the right direction on what my issue could be.
sorry for the rambling i was trying to get as much information in as possible that i thought could be helpful.
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