Very informative in a perfect world I would like to see a similar demostration with shock travel up and down,pinion movement under accelaration and decellaration as well as drive train alignment or mis alignment side to side as well as other issues that are found in a race car chassis.In mechanical engineering class some 47 years ago we had a professor build some thing similar with the final joint attached to a fixture that was spring loaded so that it could be tilted similar to pinion rotation and move up and down like shock travel and a adjustable base to simulate different aligmnents.He also had sensors and indicaters to graph the effects of these angles for vibrations(harmonics) and paracitic drag or power lose.All the movements could be controlled by a series of levers while the assembly was under power.If memory serves me correctly his class on drive train dyanamics was funded by GM.Ford and Chrysler.