There's a strange noise in the vechicle while changing the gear down......

Average vechicle...can anyone help me out...there's a strange noise(takk,takk,takk) while shifting the gears down or while the speed of vechicle is reduced to stop the vechicle....does anyone of the users feel the same in your vechicle....the pick up of the vechicle is quite kkk...since its a 800cc engine quite not possible to expect more in regards to performance....te fuel economy till date is up to 17kmpl....but 800cc engine of same segment like alto 800 or eon have better mileage output....awaiting for better results in the future.