4kqs Rear Suspension Question

[hans@caere.com]

     Hi All,
     
     I've got an question regarding my 87 4000q.  Most of the time, not 
     always, the rear end of the car seems to "sway" after hitting a bump 
     or some railroad tracks.  The sway feels like a side to side motion 
     and it feels like it's coming from the read end.  Any ideas on things 
     that I ought to check?
     
     Another question, it might be related.  I've noticed that the rear 
     tires seem to wear faster than the front tires.  Is this normal on an 
     AWD car?  Previous to this car I had only FWD cars and there the 
     fronts wore much faster than the rears.
     
     Any suggestions are always appreciated.
     
     -Hans