Noisy downshifting

Is it normal to experience a distinct clunking noise when downshifting into first gear? My dealer indicates this is normal but I don’t want to risk damage to the tranny if it is not normal.

Manual or automatic? Year? Mileage? When the noise occurs? Temperature related or not? More info means better answers. Help us out some!

2011 Scion XB. Auto trans. 5000 miles. Noise occurs at about 12 MPH as tranny downshifts into first gear. Not temp related.

I would drive another 2011 xB from the dealer’s lot and see if it makes the same noise.