Found this at Edmunds,
Limited-slip differential (LSD): Whether torque-sensitive (based on a mechanism with either worm gears or a clutch pack) or speed-sensitive (based either on the use of viscous fluid or a combination of hydraulic pump and a clutch pack), an LSD ensures that the driven wheels rotate at the same speed in order to optimize traction. In ways that only a mechanical engineer could explain, an LSD is as useful at a drag strip (so you don't leave one stripe of tire rubber) as it is on twisting roads (so you can maximize speed at the exit of a corner). If there's nothing to control the torque distribution between right and left wheels, it's an open differential. The Ford's got an LSD and the Dodge doesn't — sort of.

In its own corporatespeak, SRT calls the Challenger's rear end an "anti-spin differential." We would describe this as a brake-lock differential (BLD), which actually means it uses an open differential and traction control sensors to detect wheelspin and then applies a brake in order to direct torque to the other wheel. The BLD works adequately for many situations, like getting under way from a stop in conditions such as when one wheel is on pavement and the other is in the mud. But the BLD also suppresses the car's ability to powerslide around an uphill hairpin. A true limited-slip differential is standard on the Bullitt and won't be available for the Challenger SRT8 until next year, and then only in conjunction with the Track Pack.

Electronic stability control (ESC): It's only a matter of time before every new vehicle sold will have one more way of saving you from yourself, as new federal standards for stability control will appear in 2010. Of course, with these two cars, that's probably a pretty good idea. If we had to split hairs, it's nice to have as many of these choices as possible within the sometimes strict confines of electronic nannydom: 1) an Off button; 2) an Off button that can be activated at any speed; and 3) different thresholds of stability control intervention. There's standard three-mode ESC on the Dodge, but it's not available on the Ford — for now anyway.

WHERE'S THE BARF BAG