Here's how to remove the cab of the Ford with Powerstroke 6.0L. This text is adapted from information provided by a Ford master mechanic. To be fair, this procedure is recommended only when removing the heads to replace the gaskets, or to tear down the engine internals.
remove the rear seat if 4 door
remove all the cab bolts 6 for single cab 8 for super can and 4 door.
disconnect the ground cable on the passengers side of cab,
remove the air intake, both batteries,the abs module (under the battery tray) and the bracket bolts.
remove the intercooler pipes, power steering line from the tank to the pump and the psi line at the gear and the return line at the booster.
remove the radiator support bolts, drain radiator and remove upper and lower hoses.
disconnect several wire connectors on the drivers side fender well
disconnect the main harness from the engine at the pcm.
disconnect the body ground at the passenger side fire wall and a ground next to the battery on the driver's side
remove the e-brake cable connector under the drivers door and remove the cable from the cab support.
remove the shift cable from the trans and the trans bracket.
remove the battery cross over cable on top of the radiator, disconnect from core support and lay on the lh side of engine.
remove the brake master cylinder and leave the lines connected, the master and the abs module will not need to have lines disconnected.
remove the bolt from the steering colum at the gear box and collapse the column until it is up next to the booster.
remove the fan shroud. If it has not been cut you will have to cut it at the seperation line with the two holes on each side the shroud will seperate the the upper comes up and the lower will come up as well. Be careful of the radiator nipple. The fan and stator will stay with the engine. The radiator stays with the truck.
evacuate the a/c and remove the line from the accumulator and the upper line from the condensor as they will stay with the engine.
disconnect a few extra wires as you start to lift the cab.
More information here
http://www.justanswer.com/questions/z9bv-cab-removal-04-f250-6-0l