The part numbers that needs to match up on the PCM on a 2004 RAM 1500 should start with a 0 and end with 2 letters.
yes you can
The automatics are not interchangeable.
A 1998 Dodge Ram does not have EGR.
It is not a single digit. It is the combination of numbers that the dealers system can use to match up to a build list.
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.
no
The Ram does not have a timing belt.
yes
No