Hi, I have a 2004 td5 defender 90. I get a strong vibration through the hole vehicle when I accelerate above 50mph in 5th gear. It seems to be connected to engine speed not road speed because I get it in 4th gear about 40mph as well. I've changed the propshaft UJ's just to rule them out, but its not made any difference. Has anyone got any suggestions what I should check next. Thanks