[hugger6933]

I unhook the cable but that is just being that has carried over from when trucks first had ECM's back in the 1980's. I am still in that habit. most of the time the cable is unhooked cause the truck is torn apart anyway. As far as the tank goes I've welded in rear sections [frame] a bunch of times without removing the tank. You are gonna need inner wheel "humps" as they are gonna be rusted too. Check te lower cab corners and rockers you may need those too normally if the bed is rusted the cab will be too. Jim