Analysts had previously believed Unite would back OneEquity, the other main headlining bidder for Ford's prestige brands, due to its market positioning and the possible outsourcing of work if Tata wins the bid.
However, Tony Woodley, Unite’s joint secretary, said: “If a sale is decided, Jaguar and Ford factory stewards felt the best interests of the workforce would be served by finding a partner with an established background in manufacturing.
“Based on serving the best interest of the union members, the stewards agreed that Tata best fit these criteria.”
Ford is expected to choose a winning bid before the end of December.
Indian-based Tata Group comprises of 98 operating companies in seven business sectors: information systems and communications; engineering; materials; services; energy; consumer products; and chemicals.