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Forget about the vacuum stuff if the lever itself is froze. I would get under there and lube as much linkage as you can, and try to get the linkage moving at the case. It could be an internal issue too, but I've not seen alot of failures like that. I'm assuming again, that the lever also will not go into low range?



I had a 88 4wd pickup, but I thought you had to push down on the shifter to get it to move back and forth. I could be wrong, been awhile, long while. But I agree, you have to move the shifter before it signals the front axle to lock together. Spray the bejebees out of the linkage, and see if it moves.