Can i transfer car upgrades from gta v to gta online?

Grand Theft Auto Online is a separate online multiplayer experience that shares the same world as the single‑player game but runs on its own infrastructure. In GTA Online, all vehicles, weapons, and upgrades are managed through the game's own inventory system and are not linked to the content earned in the single‑player campaign. Consequently, any customizations you apply to a car in GTA V are only available within the single‑player story; they do not carry over to GTA Online. If you want a specific upgrade in the online mode, you must purchase or craft it within GTA Online itself.