Because the Accufab trigger wheel is designed for the old style, 96-98 non-stepped crank gear. Which to my knowledge, no one makes a billet crank gear in that design. So you have two choices with the S869HP. You can use the OEM stamped steel piece or the three letter billet. Or you could have someone machine the Cloyes billet gear to accept the Accufab trigger, but that seems like a lot of BS and expense.why won’t the Accufab trigger wheel work with this gear?