There are a number of concerns here:
First of all, is it a ZJ or WJ? They have different systems (viscous coupling versus gerotor pump). If WJ, 4 litre or v8?
Shouldn't be a problem taking out the front driveshaft - we have done this on a couple of MJOC trips when front driveshafts have been damaged.
Front doesn't have LSD so should be no dragging of front tyres, but be aware it is an "on demand" 4WD system, so could be getting some drive to the front anytime.
Economy is a disgrace, unless you are stuck in peak hour traffic constantly. I would be having it plugged into a computer to see that all sensors are working correctly. If 4 litre, I would suspect TPS, but get it plugged in.
Won't make any comment about only your wife being able to hear it...... they are a different breed..... (oops, that was a comment!)
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