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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
And that's not even the worst part Computerized dash vs analog, some sensor differences....
I have op the simple answer I remember working on my dad's old cars (pre OBD1) then when OBD2 came out I changed with the times well he did not lol still prefers his Power Wagon over his 4th gen
As has been stated, the 98 PCM will not work. Find the part number of your PCM and search for that same part number for a good used one. You should easily be able to find one via car-part.com, ebay.com, etc.