I have a l800 ford truck with a 391 I am looking at a 3208 cat is the swap possible has anyone on here done something like this?

 

First thing is to look at what your truck may have come with from the factory. Did the L800's ever come with a diesel?

 

A very doable swap, the diesel versions were the L8000's. However there s a bit more than just a engine swap, you will need to deal with the gearing as well. If you have juice brakes, you will need to deal with a vacuume pump as well.

Not sure it really is worth the effort though, unless he L800 you have is incredibly good condition, or set up as a one off type rig that has a specialized function as already set up L8000's with the 3208 are readily available. Many older good diesel trucks are coming out of CA as they cannot be registered / used without modification to meet the particulate standards, and that is if the manufacture even offers a retro fit kit.

I think if I were going to put forth the effort and cost to do a diesel swap it would be a with something that has a bit better reputation, and more importantly is a linered engine so rebuilding is practical.

Just my thoughts, David