I bought a 1995 f-150 for giggles and for stupid moments when we go camping, It has manual locking hubs. I cant for the life of me figure out if this is a shift on the fly type of deal or should i stop, hit the button, then continue. To get 4wd to disengage i have to stop and back up a couple feet, otherwise it will remain engaged as long as your moving as far as i know. Does anyone know if this is an old school system or what!! i dont want to caravan thru some mud, hit the button, and loose all momentum if i have to stop to engage, and i certainly do not want to snap a hub or u-joint by thinking its not engaged and cruise on down the pavement after the muddy road.