does the vibration happen:
in gear when rear wheels spinning = yes
out of gear with foot on clutch?
in gear with foot on clutch?
in gear with rear wheels spinning, and then clutch in and let engine idle, with wheels still going?
vibration same as engine speed = engine, clutch, flywheel, insput shaft or mainshaft of box.
road speed = output shaft of box, tailshaft, diff, wheels..
has the diff shifted? ie the pinion is pointing at significantly different angle to the gearbox axis? either up/down, or side to side or both?
that would cause the unis to spin at slightly different speeds = vibration..
where the gearbox bolt definitely down up tight before? gearbox mating enough so the input shaft slides into the spigot bearing?
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