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full time
in a xj the transfercase has what is known as a viscus coupling it is suppost to allow limited slip between front and rear driveshaft
ideally for snow and on pavement use
this is known as part time use
full time operation is when the differential in the transfercase is locked together ( kinda like a spool ) but disenguageable
the older chevy ford dodge had lockouts so the vehicle would not move in part time just like a open diff with wheel off the ground
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