The D3 series recognise a DX lens on the bayonet and automatically shoot in "DX crop mode".
You might see vignetting in the viewfinder, but you won't in the final image because you will get what is in the cropped view as the final image. I haven't used a DX on a D3 series, but t says about it in the manual....stick your 17-55 on the front, shoot a subject that you can tell what was in the finder aginst what you get in the image and see. I am sure the image will will be a cropped, DX one - is there an inner frame line that appears when you mount the 17-55? To show the actual "taking view" of the DX crop.