Think twice before attempting this yourself. I have a 1989 E350 as the chassis for a Telstar RV. It appears the steering pump has never been changed and now I know why. Today is my 4th full day of work trying to get the old pump out. It took 2 days just to get the pulley off the old pump, and the mounting bolts are behind the pulley. There is absolutely no way to access behind the pump to remove the either the high or low pressure lines, or the adjustable bracket that is also holding the oil dip stick. You will end up with very sore knuckels and have to remove the engine cover from inside the cab to access the last bolt keeping the pump in place.
Hints: If the previous mechanic didn't put some sort of anti seize lube in the pulley core you will be working the gear puller a millimeter at a time with a long piece of pipe for leverage. You will have to secure the pulley via an inventive arrangement using the belt tensioner and a long handled wrench since all other holding points are brake or A/C lines.
Ford no longer stocks or sells the needed pump. You will be referred to an after market parts dealer so you may as well start there.
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