Learn from my mistake: clunking diagnosis

[TOKKA]

tom4bren,

In reverse, the acceleration required to reproduce the "clunk/tap" was significally lower, lol, but I try to be hard.

Thanks for your suggestions, all were previously checked and serviced to no avail. On helicopters we had to balance the driveshafts that link the XMSN to tailrotor, or there would be a dynamic vibration produced throughout the aircraft. I'm wondering if something similar could be happening here... pinions, universal linkage, ??? It actually feels like the tapping produce from a Cobra (helicopter) vibration supression system VSS used to counter vibrations.

Anyhow, I'm still looking. %-(