Harmonic vibrations at speed normally come from out of balanced drive shafts or drive angles of the drive shafts not set correctly. IT can be from worn slip joints and dry u-joints. Have a engineering shop that specialises in tail shaft manufacturer to check it out as they will have the gear to check all the items.
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Harmonic vibrations at speed normally come from out of balanced drive shafts or drive angles of the drive shafts not set correctly. IT can be from worn slip joints and dry u-joints. Have a engineering shop that specialises in tail shaft manufacturer to check it out as they will have the gear to check all the items.