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I am planning a smooth sloped front skidplate that diverts the air down below the front axle for my CJ.
Also see about tucking up the transfer case and installing a "tummy tucker" skid plate. It will catch less air, and improve clearance.
I think the 4.0 has a locked computer, which means the best you could do is alter the sensor readings before it gets to it. I don't remember if the 98 4.0 is EFI or carb.
Vent the engine compartment, when I did so to my CJ it dropped the engine temps by 10F. I am also looking at building a skinned grill guard to divert air at speed around the grill inlet with the sides open to let air in at slow speeds.
What size of tires are you running, current mods etc..
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