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the chain drives both front and back axle shafts so if it was a chain you would be going nowhere
check for front hub/s for activation or locking in because if one is not operating ( broken axle ) you will not get an engaged action
I think you have a separate actuator on the front diff which operates off vacuum. The vacuum can is under the battery tray and any lines leaking can cause this issue.
The power to the switch seems to be the issue. The vacumm switch is
just a normally closed switch,meaning only when it gets power, will it
send vacumm to the hubs to allow the 4wd to work automatically. You will have to trace the electric back from the switch,to see where it goes,
a relay or fuse. You may just have bad relay contacts. Good luck.
You can always run a toggle switch into the cab,to get the system
working until you figure out what's wrong in the mean time. Just a thought. Good luck.
Check the automatic locking hub on the right side. BEWARE: You MUST have the appropriate special service tools for this job!!!!!
The vehicle will not engage in 4WD operation when the vehicle is off the ground, as the automatic locking front hubs require front wheel load to engage. When the hubs DO lock, it is normal to hear 2 to 3 soft clicks. Anything after that indicates a problem.
If memory serves, there is a cam bushing behind the plate that will wear out, and if the plate is worn out, the hub clicks and will not engage.
I had the same thing happen. The automatic locking hubs are faulty, causing one or both hubs to try to engage or disengage onto the front driveshaft. This makes the clicking noise and loud clunking that you hear. You may notice your steering pulling to one side of the road,because one hub is locked in. Replace the automatic hubs with new ones, do not try to fix the old ones. I liked the
convience of automatic hubs but replaced mine with manual hubs, there just way more reliable.
If you are not using your 4WD more often, your front automatic locking hub will malfunction,
You need to have it cleaned and lubricated, dont use grease please
Good one!
Now...
Go ahead... You were (maybe) inspired by these FIXYA volunteers... Get wild & GIVE
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