Hi Tom. I'm not sure what you mean by a 2 way cylinder....are you talking about a slave cylinder type setup like the early Mustangs? If so, I'm not so sure Ford ever offered that from the factory on F100's.

Ford started the twin-i-beam suspension in 1965 but didn't offer power steering until 1966. It was a Bendix integral gearbox that was noted for leaks, etc.
Bendix P/S: 1966/68 F100/250 2WD / 1969 F100/250 2WD before serial number D96,001. After that they changed to an intergral PS gearbox that I think was built by Saginaw.

If you scroll down thru this link you'll find schematics for the Ford F100's offered from '66 thru '79 or so. Since you didn't say what year your truck is, I don't know if this helps or not...
Ford Truck Technical Drawings and Schematics - Section C - Steering Systems and Related Components