On the ford "build and price" site, when searching through dealer inventories, under the "engines" drop down menu, there is "4.6L V8 (supercrew)" and "4.6L V8"

Is there a different engine in the supercrew vs reg/super cabs?

 

I think it is listed that way just because the 4.6 is standard in the Supercrew and optional on the supercab. Im pretty sure it listed like that so it will reflect the correct price.