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Our 1998 Jeep GC had the NP 242 case in it, 2hi, 4hi part time, 4hi full time, N, and 4 low part time in that order. The full time mode was nice for winter driving when the roads are mix of bare asphalt and snow and not having to shift in and out of 4wd part time constantly, and it was a quick bump forward to the part time mode if I needed to lock in it for deep drifts or bad side streets. I want to swap a 242 into our 1988 Dak instead of the 231 it has now.
 

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yes, the newer auto 4wd systems use the same ABS wheel sensors to monitor wheel slip and control power output from the transfercase accordingly, along with using the brakes to modulate wheel slippage. My wife's mother has a Chevy Equinox awd that works like this. While its a car based awd system, the basics of how it works is similar. I like the 242 xfer case set up with dedicated 4wd full time/4wd part time selections, along with 2wd for summer time driving. I found in our Grand Cherokee, the full time mode was nice for stablity in high wind conditions when I was towing trailer, in a cross wind condition, she was less prone to sway and just felt more stable on the highway. Same thing in heavy rain conditions with ponding on the road, just put it in full time mode and she was more stable, less hydroplaning and no rear end slide in corners. You could also take off from a stoplight quickly if need be without any rear end wheel spinning. My Dak has no problem spinning both rear tires if I come off the line to fast in 1st gear, they hit that painted white line and its spin city. I have to reclutch and upshift to 2nd to stop it normaly, if I get out of the throttle and dont shift, the bozo in the car behind me normaly about rearends me from the sudden slow down. Mike
 
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