After I lifted my Cherokee, 3.5 RE, my T-case will not stay in 4LO. I can get it to go in and can drive it in 4LO until I put a load on and then off of the drivetrain, then it will pop out of 4LO and go into N. I have also had it come out of gear just enough that only the rear wheels were getting power. I have tryed adjusting the linkage, but this didn't work. When I adjusted the linkage I had to force it into gear and then hold it there while I adjusted the linkage. If I didn't hold it there it would just pop right out. what is going on???