Errrm, according to a Land Rover technical bulletin a couple of years ago, ATF was causing failure in certain cases, and now ONLY use Texaco MTF-94 in R380 gearboxes, and the same is also recommended for use in LT77 boxes. Do a search on this forum, or any Landy forum for that matter on the subject. It gets brought up about every 3 months...I would NOT use MTF in a R380 transmission and seriously doubt LR would be recommending it.
These trannys have an oil pump that circulates the oil, MTF would be too heavy an oil, this would lead to inadequate lubrication and eventually transmission failure.
D2 will be fine.