[BR3W CITY]

There are two different types of Reluctor wheels, for the GenIII and GenIV motors respectively.

Because of the architecture of the GenIV computer, some folks choose to control GenIV engines with a GENIII ECM and either swap the reluctor, or use the adapter-thingy that allows the signals to work with each other effectively.

You don't need that for a regular swap; you can just use the regular GenIII or GenIV ecm setups...depending on which engine you source. There are plenty of members here with GenIII swapped trucks, and a few others with GenIV swaps using the stock ecm's.