Transfer case question

So today I was running a trail and its the first time I've gotten to use 4low and it sounds like something might be wrong. The sounds I heard were a rattle within the transfer case or maybe the transmission it was fine when under load but when it was it rattled and now in 2 hi I have a little rattle right when I press the gas. Does anyone else's do this or is there something wrong?

Try to double check that your transfer case is shifted completely in gear. If it's in between gears or off just a bit, it can and will rattle.