According to the owner's manual, 2018 Expeditions apparently do have a "4H" option, but there's no button for it and it's not clear how it's activated. 2018 Expeditions with 4WD that don't have the Heavy-Duty Tow package get "2H" and "4A" buttons on the console. HD Tow comes with an "electronic limited-slip" rear axle and adds "4L" and rear locking differential buttons around the "Drive Mode" knob.
There is not really a functioning 4x4 High mode on the 18’ expy, it’s non existent. The 4A is what they refer to as 4H because it isn’t a low range gear selection. It is NOT a fully locked 4x4 High selection splitting torque 50/50 all times as we have, it’s techinally not even 4x4 it’s AWD. 4x4 Low is not standard and is an upgrade item. We have 2H 4A 4H 4L as it should be when you option 4WD on a full size vehicle.
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