Matt Smith

I REALLY NEED HELP!!! ​​​​​​Well idk if this is something internal or what but it's driving me crazy! This is my first 4x4 and a little knowledge would be awesome.I was off road when all this happened. Almost like I'm slipping into neutral with no gears but played with it and finally got it out of the woods. Got home was messing with it the next day and it only had reverse now I'm stuck in a forward gear. I'm having a problem getting the transmission to shift into park reverse or even neutral. The gear shifter says park but it's as if it's still in drive. If I shift down to reverse I have a whinny sound but it like it's still trying to move forward, same as neutral... Anything would be helpful.