I have a 2002 Td4 with 150000m on clock. Developed sa clunking when turning right - seems to be linked to road speed than engine speed. Recently developed real nasty clonking when towing my caravan - again seems linked to roadspeed 50-60 mph but continues even when I take foot of the accelerator. No problem when not towing except when turning right. So I took off probshaft with vcu and retested - still got the problem. The knocking when it happens is really noisy and it is diificult to see if it is comming from theback or the gesrbox area. Anybody with experience of this problem. I would hste to change one if the problem was the other???