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Message: <blockquote data-quote="MustangChris" data-source="post: 514012" data-attributes="member: 10830">i dont know the exact math formula, but i would assume that the rotating mass (Driveshaft, FW, wheels, etc) would be more of a burden on the car than dead weight.Once you get your 3,000 lb. car moving (ie: the frame, suspension, motor, tranny, interior) that now has momentom (sp?) whereas the motor STILL has to send power to move: the pistons, the rods, the crank, the flywheel, the clutch, the tranny, the driveshaft, the diffy, the axles, the wheels, (and anything else i may have forgot.) so the lighter and easier these parts are to move the better.anyways, the real reason i posted a reply was to ask:what is the purpose of the dog bone? why did ford put it there?</blockquote>