apparently I was not clear enough with my original statement...
for it to be an 02 with the 03 rear end, it would have had to have been an ls sport that had options removed. (wheels, lips, etc) it's more likely that it is an 03 (since 03 went to all eco regardless of trim)
in 02, LS Sports were the only eco equipped cav's. the ls could be had with the sport appearance package but still had the 2.2 ohv.