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F450 has a different transmission than an E450.
An E450 cannot be manually shifted up or down through the gear range.
An F450 allows you to select any specific gear up or down.
The transmissions are not, per a respected member here on the forum, more than close cousins. I asked about trans control earlier this year and he responded with the only reasonable answer I've seen on-line anywhere.
Call a tuner or 4x4 shop as suggested.
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