hi this is my first post so hi i hav bought a td5 disco on a 2001 it has 90,000 miles everytime i so much as went on a right had bend it starts whooing from the rear but stops wen going round left bends so i took it to a landrover guy an said he thought it was the back axle and the prop uj could of gone but he didnt hav a proper look just drove it for me so i hav a friend who is a mechanic an he checked ujs an said they were all ok so he has dropped the oil in the axle an refilled it and he has put this stuff in the guy in the landrover garage told me to put in it goes in gearboxs an axles to help oil stay on cogs i think but anyway now i hav done this it sounds louder whooing noise than before could it b the rear axles shot or could it b something else i hav searched the web so much trying to find wot it could b really need some help pls