I will advise against using J&R driveshafts, as there are many tales of their driveshafts being utter rubbish. A lot of Focus ST owners have had real problems with J&R shafts.
The volvo driveshafts are extremely expensive however.
Isn't always driveshafts that can cause this.... Lower gearbox torque mount can cause vibration. Driveshafts will be the most expensive thing that can cause it if you buy OEM ones (recommended).
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