The £1.1bn takeover will lead to the cutting of 1700 jobs from the combined business, with 900 of those coming from the RAC.
Aviva plans to save £80m annually by removing duplication, making supply chain savings and offshoring of back-office and administrative roles.
Marketing is expected to be badly hit. A spokeswoman for Aviva confirmed it had identified marketing as an area of duplication. She added that it was also planning to merge the marketing budgets of the two companies, which at the RAC is handled by commercial director Lewis.
However, the RAC said no decision had yet been made on which jobs to cut.
Aviva's main UK brand is Norwich Union, whose media buying is handled by Brand Connection; Abbott Mead Vickers BBDO deals with its advertising.
Partners Andrews Aldridge handles the RAC's advertising.
It is not known how agency arrangements will be affected.