You should have linkages between your transfer case and the tansmission tunnel. Check to make sure everything is connected. Climb under there and have someone else shift the engagement lever and see what's going on. I'm willing to bet it slipped out of the knuckle.
If it did, you need to figure out WHY it did. Are/Were your motor mounts bad? Is your transmission mount bad? Those things could give enough play that the lever yanks right out of the bracket.
Take a look at it and update us. We'll go from there.
Thanks, i dove under there, there is no shift lever, and honestly im not worried about 4 low, im more concerned aboiut why the front wheels wont lock, im guessing the actuator is bad or maybe the i ahve a vacume leak.
No shift lever? Hmm... I'm not sure exactly how those Explorers engage. Wish I could help you out. I'll talk to some 4x4 friends and see if any have owned an Explorer and if I get anything, I'll post it here.