if the KJ didn't come with a factory tow package, it may or may not have come with a factory installed transmission cooler. Check by looking in the grill at the radiator to see if one mounted on the lower part of the radiator, check the previous post (kic) for pictures, it will show you what to...
These 3.7L engine's are notorious for dropping valves seats when overheating. Was a compression test performed? That would identify as to a dead hole and get you closer to a diagnosis.
Just finished this repair on '06 KJ with 108K milage.
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