GM has improved its relationships with its suppliers by leaps and bounds, its score up from “Poor” two years ago to the high end of “Adequate” this year, closing in on “Good.” Meanwhile, Nissan is heading in the other direction, ranking lowest of the six U.S. and Japanese OEMs measured in the study.

GM actually puts more pressure on its suppliers but it treats them better and the payoff is better," said John Henke, president of Planning Perspectives, the Michigan research firm that conducted the study.

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