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Is the engine actually revving up before changing gears or dose it just sound like it is?
In most cases if you only hearing the sound that usually means the noise is coming from the clutch fan. Has the clutch fan been checked?
The clutch fan should engage as the engine temp increases to cool the engine. When the engine is cold you should not hear it. If its noise all the time then it may be seized up. I would start with having it checked first. If in fact it is seized up then it will need to be replaced.