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That shift pattern sounds odd, but close to a (New Process) NP-205. No 2-Low unless you had it twin sticked?
Other transfer case to have is a NP-203 full time 4x4 transfer case. With NO lock in/out hubs on the front axle.
In the pic below a NP-203 is on L/H side and NP-205 is on R/H side.
"The Ford Dana 20 transfer case is gear driven with a cast iron case. It was used in early Broncos from 1966 until 1977 and it was used in some Ford pickups. It is drivers drop and it was available with a couple different low range ratios." ?