YJ, eh? They have the CAD right? (central axle disconnect)
Might be the vacuum isn't getting to the front axle, and locking it in?
Nevermind, just re-read, you get nothing in 4-LO.
Could be the linkage, or more likely, the plastic bushing(s) where the linkage is held to the tub and tranny, one bushing on each side of the rod.
Happened on my '93 ZJ (why I got it so cheap!! he thought lo range was gone!)
I believe the YJ and newer rigs are set up like this, with the linkage running from the tub to the tranny.
Should be easy to spot from underneath.
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