The "weak link" is usually the flexible coupling that is installed between the gearbox and generator. Newer turbines may also incorporate a torque limiter that is built into the coupling, which allows a slight "slip" when very high loads are encountered (perhaps for 100ms). The torque limiter...
There are several dozen different types of shaft couplings, none of which are perfect, but several will probably do the job. Ultimate selection will depend on torque, speed, misalignment and environmental conditions.
Alignment is a key issue, but during operation unavoidable...
