[FC] Rear end noise

[Charles M. Wrobel]

Gentlemen

There is an unkown noise coming from my van's rear end.
It is kind of a low volume muffled "tock". It is in
sequence with the rotation of the wheel. I think one
revolution equals one tock but I will be checking that.
I jacked the left rear wheel off the ground keeping the
spring under load and turned the wheel but no sound. The
bearings sound fine.

Also, and probably related, there is a mild squeaking
rhythm when decelerating in second gear. It sounds much
like dry u-joint but my u-joints are new under six
months old and installed by mechanic.

any thoughts?, thanks

Charles