Hey guys, I'm having some problems in my 04 Silverado z71 with 109k miles... Recently I changed out my transfer case because mine was grinding and worn bla bla whatever, but I got it fixed.. Now all of a sudden, my 4x4 is not working and there is a horrible vibration coming from up front anywhere from 15- 40 mph (fastest I went was 40 because I was afraid my truck would fall apart). I'm lost on this one, first time I've encountered this problem and it can't be good.. The way its going i'm about ready to take this thing to the junk yard and count my freaking loses because its one thing then another then another. Please help me out..