goodmang

Hello, My '99 Td5 GS 5 seat manual has a loud knock when turning or starting off. This started a couple of years back as a "click" but my local garage could never find what was wrong - indeed during wet weather the noise disappeared. This knock can also be felt coming through the drivers seat. The car is raised by 40mm, has been fitted with Polybush's Disco 2 kit and has done 222K miles (new engine at 63K, but original gearbox & clutch). Any ideas what it could be ? Cheers Gavin