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well, the reason CV joints are called CV (constant velocity) and the "normal" universals are not is because with normal universals, the greater the angle that you have them bent and twist, the more "reset time" they have. Normal u-joints have this annoying little trait where as you spin one end at an angle there will be a period of time where the other end slows down (so the joint can change geometries) then speed up again to catch up. At high speed, this can cause massive vibrations and u-joint failure. That why there has to be 2 or an even amount in a row to work correctly, in an opposing way so that their reset times cancel each other out. CV joints get rid of this problem, because there is no reset time. Both shafts will always spin at the exact same rate, up to the limit of the joint.
My car uses u-joints for the driveshaft (2) and the steering column, and CV joints for the wheels.
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