I need to replace my radiator on a 04 Nissan Titan 5.6 2 WD, and I would like a diagram showing how to do it.

From the 2004 Titan Factory Service Manual, You can get one Promanuals. I hope this helps. It's straight forward procedure.

1. Drain engine coolant from the radiator.

2. Remove air cleaner and air duct assembly.

3. Disconnect A/T fluid cooler hoses.
(Install blind plug to avoid leakage of A/T fluid)

4. Disconnect radiator upper and lower hoses from radiator.
CAUTION:
Do not allow coolant to contact drive belts.

5. Remove the lower radiator shroud.
( Release the tabs, pull lower radiator shroud rearwards and
down to remove.)

6. Remove the radiator shroud upper bolts and remove the radiator
shroud upper.

7. Remove the A/C condenser bolts and brackets.
NOTE:
Lift A/C condenser up and forward to remove from radiator.

8. Remove A/T oil cooler bolts and oil cooler from radiator and
position aside.

9. Lift up and remove the radiator.
CAUTION:
Do not damage or scratch air conditioner condenser and
radiator core when removing.