Help needed

I bought my baravada six months ago with 100,000 miles on the odometer. Recently as I'm driving down the road my transfer case has a rhythmical squeak coming from it. My college teacher and i think its the transfer case motor. I have a new one for it just never installed it. What is all involved in changing the motor? Also now when ever i hit a pot hole or a bump a grinding noise starts but as soon as i put my foot on the brake then it goes away until i hit another bump or pot hole.

Also would any transfer case fluid come out of the transfer case when I take the motor off the transfer case.

Here's a thread,

http://www.automotiveforums.com/vbulletin/showthread.php?t=1073006

Here's another one,

http://www.automotiveforums.com/vbulletin/showthread.php?t=897107