The funky looking knuckle on the steering shaft (just as it changes angle and goes through the bulkhead) is making a bump-bump as is turn right and left. If I jiggle the joint, it shows some slop and recreats the bump noise. Can these things wear out, and if so, where can I get another one?
Thanks

The universal joints can wear out or sometimes bind up. Sometimes the joint gets loose on the splined shaft causeing a knocking noise. Crank down good on the pinch bolt and see if the problem goes away. Most likely I have a used one.

It seems like the top on wears out but the bottom one does not due to the angle. These joints are NLA but I have many spares if you need one. I am going to try a set of later 911 ones when I put my car together. They seem to be a little larger and I don't know what the clearence issues will be.

Thanks guys.
It is the bottom one that is worn.
Ed, I tried socking it down tight already.
No change.
Would you please check to see if you have an extra?
PM me and I'll try to get it from you.
Thanks

PM sent