Well you don't have to pull the cab to do head gaskets but it makes torquing the heads down way easier and you will get more accurate torque.Ive done it both ways, its all personal preference.As for a procedure for pulling the cab on a 6.0, i dont think there is one.Just take your time raising it up and keep your eye on everything.Example i forgot to disconnect the parking brake cable on the first one i did .Its looks like your in Pennsie as am i.What dealer ya work at?How far are ya from Scranton?