Can be seen happening in this recording I made: https://youtu.be/pD_eG_B7DiE?t=237 (starting soon after 3:58). Since recording this video I've spent more hours in the Slick and it is not an inevitable result of flying with a squad (or slingload), it is just requiring more careful inputs than I was making in the example video.

The Huey was notoriously low on power in Vietnam, IRL the pilots used all sorts of tricks to get translational speed to gain lift. This may be just realistic flight behaviour when heavy.

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Hey William, could you please provide a video of the issue?

I've provided a link in my original comment from May 10th, the damage causes an audible effect rather than visible. If that isn't enough I will try to reproduce the error again at some point in the next few days.

issue https://feedback.bistudio.com/T158796 seems to be directly related, if not exactly the same problem which causes this.

I have added a series of videos in response to that issue (see link), demonstrating RL video evidence of what looks like our ingame hueys being short of output lift force by at least 50%.

The videos I have linked, show takeoff torque values within the 50~70psi range. In game, it is impossible, even with near empty fuel tanks and only the pilot aboard to establish ground hover with less than 75~80psi.

Normally a full-tanks, pilot-only takeoff (as done in Mike Force), requires 90~100psi (borderline damage onset) - If loaded with as few as 5 crew/pax, takeoff does not happen before the needle sticks to 100 as the torque value flies off the scale, far into the self-destruction zone.

This would indicate a significant lift shortage in game, which I suspect requires an excess of collective input to overcome. This could be what leads to over-torque conditions, that consequently impart damage onto the transmission.

Additionally, the "too little lift" theory satisfactorily explains why it is so difficult to lift middle-weight cargos (e.g: "MF Sandbags and Tools"), and fully impossible to control the helicopter with a "MF Large Building Crate" on the sling.

The evidence for this notion all seems to match these observed facts. This should point at a probable cause, or at least hint at a place to start looking.