Very interesting WYO... the dealership did a valve job on this PA cause it sat so long a valve froze...they left off the clamps to the air pump and when I was climbing a big grade in NV it went into open loop and blew the main hose off the AIR system...with no air to the manifolds it warped the living s&^$ out of them and they started leaking.......long story..... have replaced them and built a dual system....when I tow I stay in 3rd....no OD...my fan is so loud its alarming...between the lockup converter and the fan noise you don't know what the h*** is going on...