Went to a car meeting in Belgium. Saw a lot of nice stuff and even a M35a2c.
On the trip home we started discussing if the transfercase can be modded in the following way:
Current is: 2H-4H-N-4L. Would it be possible to mod the transfercase to this: 2H-4H-N-2ExtraHigh?

For lower RPM's on the highway, for pulling and short trips I would still use the normal 2H.
This is a hypothetical question, just like to know if it would be possible.
Please no replies like: Other transmission, overdrive unit, bigger tires, other gearing in the axles.