TKE using these now Have only seen 8 units so far but allready 2 of them have a vibration in the up acc and dec. other offices have seen this as well. No answers from the factory so far. I believe the bypass piston is sticking or shuttering as it closes and opens but not allowed to open valve and look. Anyone solve this ? I did find that getting the oil temp above 100 f helps. Wondering if Enviromax oil plays a part
