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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
If you are push starting it, I'm assuming you have a manual transmission. Have you checked the clutch pedal position switch? According to the wiring diagram for '01, that's about the only electrical device that would prevent you from starting. It sounds like you have replaced every thing else.
I took some time to look at the '01 wiring diagram again. For a gasoline truck with manual trans, the coil for the Engine Starter Motor Relay is grounded at location G105. G105 is located at the power steering pump bracket. Do you have a good ground connection there? The ground wire from the relay coil is black w/white stripe according to the wiring diagram.