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Ford did away with 4H on the new model.If I’m in rough conditions or slick ones like a boat ramp I go right to 4H and skip 4A. More predictable and it’s all locked together 50/50 so no slip.
There is a selection on the Navigator (and I assume the Expedition) that is right before 4 low that is 4H (at least acts like 4H with no slippage). I tested all modes except 4 low on a boat ramp. I forget which setting this is, but it is next to the 4L setting.