Ok so my FX4 came with a stock oil cooler. It did not have the trailer tow package. Now my friend bought the same truck as me same color everything, but 2 years newer. He got the tow package and his cooler is a fair bit bigger, is that because he has the tow package.

 

yep

 

positive... u can post some pictures to see the diference

 

Tow package has larger trans cooler,bigger altanator,and hitch,wireing of course.