stu675:
How can an auto box fail to negotiate a steep hill?
The 64 thousand dollar question no one asked the people who designed the bloody thing.
As syramax has answered correctly, because speed drops faster than the reject gearbox from hell can cope with…and if our hero behind the wheel isn’t ready to dump the weight off the mid lift as soon as its possible then even if the gearbox (auto or manual overridden) can cope the hill climb might still fail through lack of traction.