I noticed a howl coming from the Minx. So I replaced the gimbal bearing . Took it out for a rip The howl is still there. I pulled the drive ran the engine "No noise" Put the spare yoke assembly into the fly wheel and gimbal bearing ran the engine "No Noise" The U joints on the drive seem good , but not sure if I should put my spare yoke assembly on and test it. I suspect the upper gear bearing as the tone changes ever so slightly when I turn the steering wheel. Any ideas?