My scan tool keeps asking me what my FasTrac # is for my 2003Winnebago adventurer. I've looked everywhere, but can't find one dfor my 8.1L vortec. I contacted workhorse, no results. looked on gm site ,found Fastrac #s for all their v8s, but nothing for 8.1l. does anyone have an idea where i can get this #. any help would be appreciated.