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The clear rear cover actually serves a real purpose. Being able to observe how the oil moves inside the centersection allows Tex's R&D team to determine numerous things-one of which is the best location for the oil pump pickup so that it will not be located inside a pocket of aerated oil. This photo is of cold oil, with the rearend spinning at 1,000 rpm. As you can see, it barely makes it up the back of the cover.