A shorter, 3.73:1 (versus the painfully long 3.31:1) limited-slip differential is optional on the GT, but autocrossers and track rats surely will want to wait for the track pack, a $1495 option to be released later in 2009. It includes the diff, firmer dampers, more aggressive brake pads, and summer tires in place of the GT's all-season rubber, as well as antiroll bars and other suspension goodies from the 2009 GT500. The transformation is dramatic on the racetrack, where the GT is well-damped, well-balanced, and easily controllable rather than wallowy and prone to understeer.
Ford knows its Mustang customers well, whether they're track junkies, quarter-mile rockers, or just people who want a cool-looking sporty car. And by making the 2010 Mustang the same, only better, Ford is giving those customers exactly what they want. The confident Mustang doesn't have to worry. Even if the Camaro winds up being the better car - like it was through the 1990s - Mustang buyers won't care.