In all but manual mode, you have the usual PRNDM selection and on the dash there is a gear position display. The gear selector position indicator lights up, and the dash gear indicator lights up. Also, the shifter position selection is highlighted.
If you hit the +/- or a paddle in normal, sport -I think- Mud and sand, baja and mall/starbucks mode, the gear position indicator disappears. paddle or +/- again and they reappear.
If you select manual shift mode, you get another indicator on the dash - M1(-10) that reflects what gear the truck is in.