Land Rovernek nézz utána jobban:
http://www.lrm.co.uk/archive/Defender/90%20Hardtop.html említi:

"With a locking centre differential but no axle differential locking available, this is the standard Land Rover set up little changed from the, at the time, innovative Range Rover of 1970."

". Axle differential locks have always been shunned by Land Rover but various aftermarket kits are available for the truly dedicated off-roader."

De a gyári honlap és az army-technology.com is csak központi differenciálzárról ír.