The automatics are not interchangeable.
yes you can
A 1998 Dodge Ram does not have EGR.
yes it is the same cab all parts will bolt right on
2002-2005
You need the user manual which has steps on how you can replace a shifter knob on a 2002 Dodge RAM 1500 with standard transmission.
Pull the gas tank and replace the pump.
The Ram does not have a timing belt.
No
yes
No you can not
how to remove and replace transmission fluid pressure switch on a 2002 dodge ram 1500
no