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Hard shifts are not improved by any type of transmission fluid.

Your automatic transmission is controlled by a computer. When it detects certain faults, the computer puts the transmission into "high line pressure" mode, meaning that it's trying to protect itself.

If it's a really hard shift, it could be that the computer has detected a fault. On the other hand, if it doesn't shift hard when you're driving, it could just be that the idle speed is too high.

BTW, when the computer puts the transmission into "High Line", it also turns on the malfunction light.

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16y ago

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