http://Putnam-Dodge-Chrysler-Jeep.com/2015-dodge-challenger.htm 650-558-5612 The 2015 Challenger moves to a new body platform, but it’s a mild change that only seasoned experts will notice. Front and rear ends get subtle revisions and the coupe’s dimensions should change only enough to welcome a rumored supercharged V8 engine for a future SRT model, enhanced cooling system and a new eight-speed automatic transmission. The Challenger carries over its V6 and two V8 engines. The larger 6.4-liter V8 gets 15 more horsepower (estimated), which Dodge says should launch the Challenger from zero to 60 in about 4.5 seconds. The eight-speed automatic transmission comes standard on V6 models, while V8s get a six-speed manual transmission. The eight-speed is optional on V8s.