Understeer
Also known as "push". This is where the front wheels that steer do not react very responsively to turning and the vehicle acts as if it wants to keep going straight. This happens when there is more traction in the rear tires than in the front. Various suspension factors can alter this effect.
Universal Drive Shaft
An axle assembly with a dogbone on one end, a threaded end on the other and a universal joint in the center. This is considered the more desirable drive shaft/axle configuration than the simple dogbone shaft. MIP market's their rebuildable version of the universal drive shaft as the CVD (Constant Velocity Drive).
Unsprung Mass
This is the relative mass NOT subject to the suspension system's load. This includes the tires, wheels and approximately half the mass of the suspension arms.
