I'm not sure what I'm facing here. My wife's 5.2 won't stay in gear... any gear... It will shift into gear and then pop out once it accelerates a bit. It makes a kind of buzzing sound and then for a minute or two it won't go back into any gear. It seems to be worse after it warms up a bit. I thought it was the transmission, but I've read some descriptions of other peoples problems that sound similar and they were blaming it on the transfer case. Any ideas out there?