wheel bearing?

[jackr@internet.kronos.com]

     When I corner in my 84 4kq to the left, there is a steady 
     thump-thump-thump sound, whose rapidity is proportional to my speed. 
     When I go straight or turn right, there is no unusual sound.  This 
     sounds like a wheel bearing about to go (right?) and it must be on the 
     right side of the car where the cornering forces are highest (right?), 
     but I can't tell if it's the front or the rear.  I also am not sure if 
     a wheel bearing makes a thump once per tire revolution vs. a steady 
     rumble.
     
     How can I find out what it is and which wheel it is?  I jacked up the 
     car and shook and spun the wheels, but couldn't detect any looseness 
     nor noises in the wheels and suspension.
     
     Jack Rich