 The Duratec engine was optional on the SES and standard on the SEL, producing .For 2005, with the LX and SES models being dropped, the Duratec was only available on the SEL, and in 2006 the Duratec was dropped altogether, with the Vulcan becoming the standard and only engine available on the SEL.Some pre-2004 Vulcans were mated to the four speed AX4S automatic transmission; all other Tauruses of this generation received the AX4N transmission.