I replaced the stock fluid with Mobil 1 full synthetic ATF in my ‘07 GT and it shifted much nicer post change.
Reviews of Mobil automatic transmission fluid
6 votes
Mobil-1 Multivehicle Semi Synthetic ATF: Notice a bit of a vibration in the brake pedal when the transission disengages (example: putting it in N while idling), or if it's shifting during a turn. Also I can smell ATF at times in the cabin and forward engine bay area, probably vapours coming through the top vent on the tranny casing. No leaks coming from the pan or bell housing though.
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