Monocoque/Unibody
 

whats the difference in them?

Body structure. Unibody cars generally use subframes...a front frame and a rear frame that support their respective components. These usually aren't good for structural rigidity since it leaves the mid section without a ton of support. Monocoque frames are like the fuselage of an airplane. It's designed to be rigid, but also to force the outer skin of the car or vehicle to carry a lot of the stresses as well. Monocoque chassis cars are usually more desireable since they provide much better chassis feel and response as well as increased torsional strength.

Man...that sounded like a textbook, didn't it?

^ yeah what he said.... has anyone ever been under a new monte carlo? The front sub frame is made out of all aluminum. Its really nice.

thanks GT40 for the textbook answer.