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I talked to two of the engineers at work (I work for an industrial gearing company). They said you are definitly loosing some power due to the extra oil in there. One said its not impossible that you could be loosing 2 horsepower through the box. At highway speeds 2 hp is a huge hit. However, both of the engineers were very concerned with the thermals of the box. The extra oil is going to really heat up the transmission. The increased heat not only breaks down the oil faster, but also pressurizes the unit beyond its specifications.
BTW, what kind of mileage are you getting in the Cavalier? You don't have a garage entry here...
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