It is in a box format.
There are three positions on either side.
Right Lower = High, Diff Out
Right Mid = Neutral, Diff Out
Right High = Low, Diff Out
Left Lower = High, Diff In
Left Mid = Neutral, Diff In
Left High = Low, Diff In
Or have I got this wrong? I've got a Defender 90 V8 Auto 1998. When moving between low and high range I have to hold the transfer box into the required position whilst moving between D/N or N/R for it to engage but then this also doesn't get used that often.
Some gearboxes don't have a Neutral, apparently but I only have experience of a Series 3, '84 RRC V8 5sp manual and a '98 D90 V8 auto.