It goes into the fire wall on the pass side next to the ac lines.
In the line that hooks to the passenger side of the intake manifold.
There isn't one.
The heater box is all electric on a 2004 Dodge Ram.
It is on the top of the transfer case.
A 1998 Dodge Ram does not have EGR.
yes
There wasn't a 1998 Dodge Ram 1500 diesel.
A 1998 Ram did not have EGR.
no
Yes it should.
No.
A 1996 Dodge Ram pickup truck vacuum hose listing and diagram can be obtained from most Dodge dealerships. Many auto-parts stores will have the diagram.