4x4 jumping out
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Just so you know you do not have 4x4... All 4 wheels do not spin if stuck, two or three might.
I'm just not following you. If your thinking your 4x4 is not working, with the Tcase in 2wd, lock the hubs and crawl under the truck and see if you can turn the drive line. If you cant, then the 4x4 is working. If you can, see what axle shaft is turning and thats your problem side.