I just finished up installing my new manual transfercase. when I got in my truck to move it out of my garage, my truck will not move at all. What could I have possibly done or what could be wrong? my truck is also an automatic. It goes into gear fine, but when I go to put it back in park, it starts grinding. What could I have possibly messed up. please any help would be greatly appreciated. Ive got to get this thing out of my garage.