OR, what about the blokes who used to pull 15 gears out of the OLD 13 speed Bushrangers?
Probably already answered by now, the 'secret' gear that Mr Fuller swore and avowed that buffoon drivers must NEVER engage. But, we all probably tried it at one stage or another, especially if getting a bit tired or not fully switched on.
Reminds me of the bloke who first taught me to drive a Spicer 4X4, used to call Fuller R/Rangers "Ladies" gearboxes. Probably only made about 27 million of them!