Autohubs locking is based on axle shafts relative movement in relation to the hubs. So, hub still and axle moving will cause it to lock (as intended, by the way). If the TC oil happens to be too thick, it could transfer some movement to the front driveshaft even disengaged. Little movement, no torque whatsoever, but enough to have the axles engage the autohub. Happened in my GQ and I recall seeing it explained here somewhere.
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