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Knocking Noise From The Engine Bay, But It's Not The Engine

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After doing about 20 miles on the motorway I pulled up at a roundabout, when I set off I could hear a 'once per rev knock'.... I put the clutch in and when I revved the car there was no noise. you can only hear it upto 50 ish before the once per rev is so fast its just a constant noise you dont really notice. It sounds very similar to a bottom end knock (but isnt). My first thoughts are gearbox or drive shaft (although iv never heard a failing driveshaft)

As usual, any opinions welcome.

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