Hi, I recently purchased a 2003 3.0 ltr TD Citation Trooper. It is a manual transmission with the 4wd electronic shift. When I disengage the 4wd drive option the light flashes for a few seconds and then it shifts back into 2wd mode, but there is a clunking sound when it happens. The higher the speed the louder the noise. Does anyone know what could be causing this as it has only recently become a problem. Cheers.