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What is happening when you get to 40? Are the revs staying high (over 3000) and not lowering? If so, that could mean it is the transmission. If it just won't allow you to accelerate past 40mph then something else is the issue. Cars have a "limp" mode when something is wrong which limits your speed, and they are typically set to around 40mph. Limp mode is usually turned on when there is something potentially damaging wrong with the engine. This is usually accompanied by a check engine light or a different warning light 

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