Not an easy swap. You will need the engine, trans, computers, wiring, radiator, abs sensors, brake light switch, accel pedal switch,....... out of the 2004 to get the engine to even run.
It may fit; but the trans, computers, electrical systems, etc are all different.
The 5.7L Hemi was an available engine in 2005.
Yes, with modifications.
A Hemi will not fit in a 2000 Ram with out major modifications.
No
It would physically fit, but you would need the proper computers, sensors, transmission, etc.
yes
will the add a leafs fir a 4wd fit on a 04 silverado 1500 2wd
No it will not.
Yes.
YES
YesYes