What can the problem be
4 lo is the only way can get the explorer to move
was driving and went around a corner and it started grinding an stoped going, put it into 4 lo and was able to continue
That will be either the transfer case or the actuator (if it's a push-button type).
There's a common problem with the actuator that's easy to fix: remove it and open it up, and look for a metal pin with a nylon sleeve over it. What happens is the nylon sleeve gets brittle and breaks and the actuator can't engage properly. Use a piece of 1/4 rubber fuel line to replace the plastic sleeve and you're done.
If it's not that then you'll need to pull the transfer case. You can rebuild or replace it: what I did was find a junkyard T-case and then used parts from the two units to build one that worked.
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