The failure I believe you are talking about, at least the one I remember was a driveshaft failure, not a final drive failure. There have been a few (a handful) of driveshaft problems on C-14s but only the one catastrophic failure that I am aware of, the others were caught through vibration and / or inspection. There have also been a very few bevel gear assembly failures but again nothing catastrophic, just noise as the main symptom as I remember.
If there are documented cases, could you please point to the documentation?
Brian
There have been 2 or 3 documented final drive failures. One of them was catastrophic enough to shatter the left side exhaust hanger/pass foot peg.