There are a few threads about this. It seems there is a spring or something that does not release in the locker. from what I remember, you can pull the fill plug and stick your finger in to get it to release, but don't quote me as my memory isn't what it used to be.
98 TJ 4i in currie with Currie bars front and rear
2014 JKUR AMP"D,Ace slider,BFG AT/KO's 33's
Ace Tire carrier/ rear bumper,LOD Mid width front bumper
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