Q&A

This may be your problem and will need replaced: http://www.autozone.com/autozone/parts/Duralast-Ignition-...
Ignition switch. If this isn't it send back to me.

spark issue, no doubt. how did you check the coil??

Roy

Crank over the engine until you hear the pump prime the fuel rail, press the Shreader valve on the fuel rail to verify that fuel is present in the rail (preferably use a pressure gauge and verify fuel pressure). I have had problems with several Durango ECUs. Get a friend to crank over the engine as you strike the ECU, if the engine starts the ECU most likely has a bad soldered joint or circuit board. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
I have had a company in the mid west test and repair the ECUs http://www.siaelec.com/

If you have no spark, the next thing to check is if you have injector pulse, this will tell you if there is a bad input causing the no start condition. Would rec. you have this properly diagnosed, just changing parts on guesses can get expensive. Hope this was helpful.
Ryan
Mode Automotive
858-361-4645