Having driven a VN Commodore half way around Australia (and torn its gearbox to shreds half way between Alice Springs and Three-Ways in the Northern Territory, that doesn't fit in with my experience - my understanding is that they're not an electronically controlled gearbox but rather are a rather simple Jatco 4-speed (4N71?) with only one throttle/load behaviour - if you drive it harder, it'll hold longer and shift harder, but that's a result of your behaviour, not because the gearbox is behaving differently itself - the only way to do this on such an old auto would be to adjust the bands or perhaps solenoids if they're in use in this design.
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