Launceston: Rampant speculation that the Ford teams in Supercars will race Mustangs next year has almost certainly ruined any chance of a switch from the Falcon until 2019 at the earliest.

Widespread coverage of a report on Wednesday claiming the change to the Mustang had been decided has caused a serious setback to the teams' efforts to win Ford's support.

A switch from Falcons to Mustangs appears to be on the back-burner. Credit:Mark Horsburgh

DJR Team Penske and Prodrive Racing Australia – the only teams racing Falcons in the Supercars championship – have been in long-running discussions with Ford in Australia and the US for approval of the project.

American-controlled DJR Team Penske have also been lobbying Ford's racing bosses at the company's headquarters in Detroit to provide technical support for the development of a V8 racing version of the Mustang.