The vacuum actuator on the fender, pulls a cable that goes to the front axle to engage, sounds like you already know that. There is a vacuum switch on the t-case that when shifted to a 4H/4L sends vacuum to that actuator on the fender. A few problem areas for those were vacuum lines rotting, cracking or rodent chewed. T-case vacuum switch picking up fluid and ATF eating the vacuum diaphragm in the actuator, if ATF is found in switch or actuator the t-case was either overfilled, or rear trans seal is leaking and overfilling t-case.
If you can't find a problem or don't want to put a lot of time or money in it then try a cheap fix. If this truck stays off road, or most of the time and you can disconnect actuator and pull cable to engage frt axle. Use whatever you want to keep cable pulled for 4wd.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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