They are located along the top of the motor under coil packs that fire the plugs. You have to remove the resonator box from the top of the motor to gain access. Each coil pack is secured with two long skinny bolts and must be removed carefully. Then simply lift it off and remove the plug directly underneath it. Use only AC Delco iridium plugs. 100k mile intervals.
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To change spark plugs on a 5.9 2002 Dodge Ram 1500, locate the old spark plugs. These are located at the end of the 8 wires inside the vehicle's bonnet. Remove the old spark plugs and replace with new.
60,000miles
If you have platinum spark plugs, 100K. If you have standard plugs, 50K.
Generally I change platinum plugs at 100K and regular plugs at 50K.