Runs fine but Won’t move in any gear

I think I did something stupid. On a trail I came across a large fallen tree. I shifted into low range and switched to 4wd thinking I could push the tree out of the trail for my buddies behind me. I don’t recall hearing anything snap. But after a little shove I thought I got stuck on a branch. Tried to back up and I came down a foot or so. Then nothing. It won’t move in any gear, but the belt is still engaging. Even in neutral the motor won’t rev, it acts like it is trying to turn a locked up gear case. It rolls freely in neutral as I had to tow it about three miles back to my truck. While being towed with the engine running, I tried at one opportunity to put it in gear and the tires just dragged in the dirt. Any ideas would be appreciated!