Anyone with Ford Truck have problems with steering gearbox blowing the Pitmanarm seal? Had an 1986 F150 and a 1991 F250 that blew out between 135,000 and 145,000 miles. Got a new Pitman arm and Gearbox 1700 miles ago and it started leaking again! My Mechanic promises a new gearbox, but what a bummer. Did Ford have a problem with these?