Ok my uncles 2003 dodge dakota sport v6 needed a rear end so it stayed at my house for about 2years in till my uncle just bought a rear end for the truck so I put it in and went to start it and nothing battery was dead so uncle went bought another battery so put it in and no start so I changed the coil and changed the fuel pump and relay and crankshaft position sensor and still nothing and got a NO bus on the dashboard I need help can someone help me find out what else to do

 

Moving this to second gen Dak section for ya.

Need to see what's missing as to why it won't start. You need spark, and fuel. (I would like to think that air simply is not an issue......)

 

NO BUS means the dash can't communicate with the engine computer. That generally means something has been chewed by a rodent, a sensor has failed internally, or the engine computer has died.