Things that go clunk

[LARRY ELSWICK <sos@kymtnnet.org>]

The clunking noise is coming from the
right rear of my Spit. It is most noticeable
when first pulling out and is definitely related
to revolutions of the wheel. Is possible to have
a worn U-joint on the half shaft and it not show
obvious "play" when I grab hold of it and shake
it. If I do replace it how much of a job is that?
Thanks!