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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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