(1)  Developed a  slight knock in the rear of my van. Speed of knock varies
as wheel speed varies. Pretty sure it's a CV going/gone bad. Just don't
know which side it's on. Is there a way to definitively diagnose this  and
on which side as opposed to having a rear brake knocking problem(which I
have seen before). I really don't want to tackle this and dismantle things
just to have a look unless  I can positively identify the problem and get
replacement parts on hand first. I would appreciate any input on this
issue.

(2) Replaced ignition switch housing with new because the  steering column
shaft was loose in the bearing bearing. The bearing itself was
non-replaceable it appeared. Within 6 weeks the steering column shaft is
loose again from apparent wear and the aluminum//pot metal housing must be
replaced again. Would appreciate any input on this issue.

Thanks