Question for all of you Ford transmission gurus: I accidentally drove all the way home in 4x4 low in my 99 Ford Powerstroke Diesel. Who knows how it got switched but that is all I know. So after realizing this, I have my wife drive the truck while I watch and the front drive shaft (4x4) is not spinning at all. I even switched back and forthe between 2x and 4x but the shaft does not spin. Is it toast or electronic where I only have to replace a fuse?