Quote:
Originally Posted by jeeptech77
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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Close... Just exactly backwards.
The standard XJ case is the NP231. 2WD-4HI-N-4LO.
Engaging 4HI or 4LO locks the front and rear driveshafts together (actually chains them together, whatever...) Great for off-road, not so much on-road.
The optional cases (NP242 et al) have the viscous coupling, and the positions you list: 2WD-4FT-4PT-N-4LO
The 4PT works like the 231's 4HI: Positive engagement.
The 4FT is the one that allows some slip between the 'shafts. Great for on-road, iffy-traction situations.
You already know to use 4LO on the trail.
Robert