Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
Having two tires and two not spinning has nothing to do with AWD, full time 4wd or part time 4wd. You need lockers + part time 4wd for all four corners to be permanently linked together.
The VC awd on the 249 can only provide 50/50 torque bias between front and rear, but it is never locked. On the 242 FT front and rear are not permanently connected either, it's full open center diff -> you may end up with only one wheel spinning in that mode without lockers.
With the 249 rear locker or limited slip is ok, in the front I'd only go with a selectable if you need all four tires pulling. I don't really see a need for that on a DD though.
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...
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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***