Wow, it's been awhile since I've been here.
I was trying to pull some out of the mud and put the 4runner in 4lo. I was stepping on the gas hard and while the 4runner was pulling the motor revved up high and shortly after the transmission disengaged. Once I let off of the gas and the rpm's can down it reengaged the transmission.
A month ago I started having problems with the 4wd engaging. I would turn it to 4hi and it was like something was binding up and it would release with a loud snap. So, It's in the shop now. Still waiting to hear what's wrong.