Citroen Berlingo noise when changing from 3rd to 2nd gear wobble noise from front

wobble sound coming from from wheels area very prominent when changing from 3rd gear to 2nd goes away when clutch is pressed returnes when clutch is released, had wheels checked inc pads brakes discs, all ok from drivers position sounds like it coming from passenger side from passenger side sounds like its drivers side, first thought was a brake callibar , now i think its a gearbox problem. going to garage at weekend for 3rd roadtest all with differend mechanics and still cant be solved