My 82 has developed a strange tapping thumping sound that only happens when
going around curves at low speeds and seems to go away after driving a bit.
 The sound seems to be related to the tires turning as it is very regular
and isn't engine rpm sensitive.  I've been trying to see if it only happens
with power on or off but it usually only last a short bit and I haven't
found a spot to do wide slow turns continuously to try and test things.  I
replaced the brake pads about three weeks ago and this started about a week
ago.   Any ideas?

Thanks,
Dave