You need to look and see if the vacuum is shifting the transfer case first. IF it is not then check all of the vacuum lines, they crack with age. If it is shifting then your front differential shifter is not working. Again check the lines first. Also these vacuum front shifter are notorious for sucking moisture into them and then freezing up and not shifting. There are several companies that make a manual cable shifter to replace the vacuum one.
I hate these type of 4wd shifters. Give me a good set of lock out hubs and a floor shifter any day. Another thing these do is if you stop in 4wd and turn the engine off they shift back into 2wd so when you go to take off again they are in 2wd for a bit until the front differential gears lock in again. My boy"s newer pickup is a dud doing feeding chores because of that. When it is muddy that little bit of spin to lock everything back up is enough to get you stuck.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
... [Read Article]
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