A clutch of investors in Chrysler have made a last-ditch effort to block an alliance between the troubled carmaker and Fiat.

An appeals court on Friday approved the sale of most of Chrysler’s assets to Fiat, the US and Canadian governments and a United Auto Workers healthcare trust. However, the court put a temporary halt on the sale until 4pm on Monday to allow three Indiana pension funds to file an emergency appeal to the US Supreme Court.