The transmission will have to be diagnosed before you can lay blame. When slippage occurs in any of the clutch packs, the computer detects it and defaults it to second gear. It will appear to have low power or struggle to get going from a stop sign, and the engine will be going way too fast and make too much noise on the highway. Clutch plate wear is common but due to the nature of the system, problems show up suddenly.
On older cars, as the clutch plates wore out over thousands of miles, the shifts gradually got sluggish. With your computer-controlled system, the computer adjusts the shift timing to maintain the appearance of a solid shift until the day comes when it can no longer update enough. That's when problems like you're describing suddenly appear.
It is common for body shops to change the transmission fluid because of all the sanding dust in the shop environment. My gut feeling is this is just a normal problem due to mileage, but you have to know what is wrong before you can determine a cause.
Caradiodoc
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Monday, January 18th, 2010 AT 4:48 AM