My single stick dana 18 is giving me fits, and absolutely wont shift from 4h to 2wd. The back story: I was pulling a spring tooth in 4wd through the trails behind my house. Haven't walked them since I lost my dog. Needless to say they are overgrown and needed attention. Tractor normally does this work, but I also haven't touched it in over a year, and it wouldn't start, so I took the jeep... Its always been a smooth shifting t case. When I was done grading the trail I tried pushing the shifter lever all the way forward to 2wd, no good. Tried it in reverse, tried it while going forward. Tried it with the jeep off. I crawled under there and had the wife shifting it 4L/N/4H but wouldn't go into 2wd. Doesn't look like anything is impeding the 2 shift rails. Drove on pavement a short distance and it seems the back passenger wheel is also not spinning freely, it's kinda stuck and just gets dragged from the front axle. At a loss as to where to begin looking at what's wrong and what to begin to futz with. Thanks.