Yeah don't let the flex discs fail, if one does it gets super expensive real fast. When they fail the drive shaft often rips a hole in the transmission tunnel, sometimes cracks the transmission case, and on W126's at least sets off the air bag.

__________________
2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200