Do you have the Full-Time 4WD?Attachment, forwards photo of the dealer's scanner record. This problem presents itself intermittently. What could be another factor as a cause of the problem?
I have Selec-Trac on my Sahara. I learned right away that I need to engage into Part-Time 4WD as soon as I hit the dirt. The first time I took my Jeep to the trail I left the 4WD in Full-Time: the clutch pack in the transfer case overheated and stunk of burnt clutch.
I’ve taken the Jeep off-road several times after that; now I always engage into Part-Time 4WD as soon as I hit the trailhead. Haven’t had any issues since.