2001 Mitsubishi Montero

Transmission problem
2001 Mitsubishi Montero 6 cyl Two Wheel Drive Automatic 168000 miles

I took my vehicle to autozone to see why my service engine light keeps coming on and once the tech hook it up to there machine it gave a code P0740 and I would like to know what does that mean?
April 19, 2010.

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