thanks for the comments, had the shaft checked by the local ford dealer, they didn't see a problem with the rubber bush, looking further tough, found out that the left driveshaft has too much play on the outer cv joint So i'll have a repair on that.
(Did order that rubber bush in advance, so i'll be replacing that anyway, doesn't cost much) Being busy at the rear, solid alu beam mounts along with a poly diff hanger will be in place by the end of the week

istvan