I've been noticing recently that at about 1800 rpms there's a vibration from the transmission. I put my hand on the transfer case shift lever to see if I could feel a vibration and realized that thing really moves back and forth every time the truck changes gears or accelerates. In my ford it never moves. Is this normal? There's quite a bit of moving back and forth.
Oh, this is a 06 5.9l with really low miles.