vibrating/ clanking

Samao

hey guys, i have a 91 rtawd, i was wondering if any one had any of these problems; at around 60mph my rear end starts vibrating. i haven't had time to check it out yet. It also makes a clanking noise in the front when taking off occasionally, but it doesn't sound like the tranny.... any one have these problems/ is it a common problem in th awd's? lmk thanks