The #97 Red Bull Camaro benefitted from the timing of a lap 27 safety car, having pitted shortly before the caution to jump the sister #88 entry, which had led the race to that point.
Once in front the double stack proved problematic for the #88, helping the #97 into a commanding position as the race wore on.
A gearshift tower issue would later extinguish the threat from the #88 entirely, while steering concerns for Brodie Kostecki in the closing stages helped van Gisbergen to a 20-second victory.
It marked a third for the NASCAR-bound Kiwi, and a first Great Race crown for Stanaway, who will return to Supercars as a full-timer with Grove Racing next season.
Kostecki cruised to second place alongside David Russell, leaving the Erebus driver well-placed for the title with just two rounds to go.
His lead is 131 points over van Gisbergen, while Brown, who finished eighth alongside Jack Perkins, is now third thanks to Feeney's mechanical misfortune, albeit 390 points behind.
Feeney, meanwhile, faces an uphill battle for the title, the gap to Kostecki 408 points with just 600 left on the table.
Source: Autosport