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Sorry, my bad. For some reason I thought it was only the F350s and above that held over the extra model year.
So to answer your question, PCM comes out from the engine bay side, but you'll need to remove the inner splash shield to get it all the way out.
I was under the impression that all vehicles were required to be OBD2 compliant starting in model year 1996. Was there some sort of exception for heavy duty trucks?
If indeed it's OBD2, I'd want to take advantage of the ability of that class of PCM to take a flash tune rather than an old school J3 adapter chip. That said, I question the value of custom tune on a stock engine.
Federal emission trucks over 8500 GVW were exempt from OBD-II standards. California emission (and a few other states) raised that to 11k GVW on some model/engine combinations.