I was asked by a coworker if i would put in a transfer case in a 97 blazer for his mom. his brother had it all tore apart when I got it so i dont know what it drove like before. He said 2wd worked fine but no 4wd. I put the case in and it drives smoothly in 2wd but in 4wd on road is drive ok but it kind of a vibration but more of a shiver. I dont think this is normal but being it is in 4wd maybe? could the actuator maybe be not engaging all the way. One more thing after getting it going sometime when i put it in forward or reverse it takes off hard like i have my foot on the brake and the gas. then it lets loose. It did sit in a garage apart since last fall. so I am thinking it is just sticking brake calipers or cylandars or maybe related to first problem? any help would be great thanks.