The front coupler was well worn an replaced.
Yet another outrageously expensive part.

The Flex Coupling was torn at one of the mounting holes.  This allowed the driveshaft to hop around and bugger the tip of the shaft.  A used replacement shaft has been found.

The legendary Cub transaxle cleverly modified for use in Cub Cadets.  Once the usual grunge was removed, there was remarkably little drivetrain wear.  There was slop in the control mechanism.

The rear cover plate had an impact scar from something big and heavy. A used replacement was found.