Hi Clive,
At rhe moment the shaft is not bolted so there is kind of a 'whiplash effect' hence the knocking. UJs are ok, checked them.
You mentioned the nasty vibration. At the moment Im getting that vibration from the rear passing 70km/h.
Should i give it a try then. Bolting it solid? Although arent the straps there to remove some sudden torsion stresses?
Regards
Christian