I have three seasons on a Teaque. I am running 680hp and have never had a problem. I service the the drive every 25 hours.
As a side note back when the drive was first built I received a call from Bob. He asked me if I could return the drive to him for service. Aparently he had a problem with some of the gears. So I yanked it off (skillfully of course) took it to his shop and he replaced the upper gears. I will admit it was kind off a pain in the ass, but it could have gone alot diffrent.