Q: Won't shift out of 4*4 low

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Im coming to u I need serious advice I have a 98 GMC sierra k1500 first the transmission that was in it when I got it blew the 3-4 clutch out for starters so I went n got a new tranny put it in wanted to test 4*4 to make sure it worked well it did but didn't bc now its stuck in 4 low so I was told the transfer case motor the transfer case so I changed both of those then it still wouldn't work so was told the transfer case control module so changed it still nothing and it blew the 3-4 clutch in this transmission as well it sounds like its trying to change but all it does is clunk around but won't ever change any advice would be greatly appreciated thanks in advance BTW I've changed all the components and put a whole new transfer case in it and how do u manually shift a transfer case

My car has 211000 miles.
My car has an automatic transmission.

If you remove the transfer case shift motor, then you can manually move the mechanism that the motor mated to on the transfer case. The motor only turns one direction or the other to switch the transfer case. If you cannot turn the mechanism then the transfer case has been damaged internally from driving on the highway in low range. I have seen transfer cases that have been internally destroyed by driving in 4WD at high speeds in this vehicle and others with a part time transfer case. You should also check the front axle actuator to see if is working properly shifting in and out. Otherwise, the system will not come out of 4WD.

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