Can you show us to model? I am sure you try to simplify something.
Did you use solidmesh or shell mesh?
Shall i upload the .PRT model?
I am not 100% i shall check tomorrow
what effect do you think the frequency should have on your simulation?
linear > apply the torque, fast results
linear > fatigue > apply the torque, fast results, understand fatigue life
linear dynamic > linear materials, "time" taken into effect