Ford Motor Co. will begin building the revived Thunderbird convertible next year as a 2002 model, a company spokesman said Thursday. Based on the same chassis as the Lincoln LS and the Jaguar S-Type, the T-Bird will be a rear-wheel drive convertible, offered with the LS's 3.9-liter V8 engine and five-speed automatic transmission. The production car is expected to differ little from the prototype concept car Ford unveiled at the 1999 North American International Auto Show.