I have seen a version that has an elongated rubber 'bung' in front of the shifter lever, prise that out and insert an old key/screw driver ect. Another I have seen is a small long button which was coloured orange, if you pressed that at the same time as you moved the lever then this allowed the lever to move, which went with what transmission I cannot answer.
regards
Dave
There's a red button in front of the shifter on mine. Press & hold to freely shift into any position.
IIRC, a dash warning light will come on if T-case is in neutral & engine not running...