i have a dumb question. Are the bellhousings the same between a 5.4 and a diesel? Thanks.

 

There is a 5.4, V10 and a diesel version for the the 99-03 06/03 is the last for the 7.3. Internally they are all different.

 

Yes and no. It depends on which diesel you're talking about. The bellhousing on a 6.0L and 6.4L is the same as a 5.4L. I think the 6.7L is the same, too, but I don't know for sure. The bellhousing for the 7.3L is NOT the same.