Only the 2wd versions have the 4.0 AMC I6 dude. In the US of A they never made an AWD option with the I6. I think they might have in Europe and Australia, but I'm almost positive they didnt in the US. And getting a 2wd jeep is no better than bringing a minivan to the party..
The AWD ZJ's either had the 5.2L engine, or the 5.9, which was only available on 1998's. Sure, its a powerful engine, but it gets even worse gas mileage than the 5.2 and is only a little more powerful than the 4.7 powertech V8 they have had ever since they came out with the WJ and the Liberty.