i was driving my truck and all a sudden it sounded like it popped into neutral. so i pulled over and tryed to put it in park but it grinded like the tranny was still spinning. So i shut it off and parked it. Started it again, drove normal then popped into "neutral" again. This time the shutting off didnt fix it. So i shifted the transfer case to 4H without locking the hubs and it drove so i went to turn around and when i put it in reverse, again same thing. Like it was in neutral. But putting in 4L Allowed me to get home very slowly. Idid not lock the hubs so it was in 4wheel drive. whats wrong?