So I have a series 2a with a rotating clunk like a u-joint is crapping out but no vibration at speed and no visible play in the u-joint itself.

It can be felt and heard (loudly sometimes) when slowing to a stop in neutral. talking about 1-3 mph. I can feel the clunk in the hand brake lever. when I gently pull the lever, the noise goes away.

Is there something in the parking brake mechanism that could be flopping around? what sort of maintenance should I do if I wind up pulling the drive shaft to inspect what's going on there? has anyone else had this issue?

I'm new to this thing and want to get it all set up just right. Thanks for any help y'all can provide

Atlanta GA