I have a 2002 Expedition with a 4.6 L engine. It came with no tow package. I'm thinking of putting on an aftermarket Class IV hitch. Does anyone know if my engine would be strong enough to pull a 4500 to 5000 lbs. travel trailer ? Any help would be greatly appreciated.

 

Here's the specs on a 2000, so couldn't be much different. It depends on if its 4x4 or not, tire size and gear ratio.
(GCWR- gross combined weight rating)
2wd-
gear- 3.31 tire- 16" Max GCWR- 11000 lbs
gear- 3.31 tire- 17" Max GCWR- 11000 lbs

4wd-
gear- 3.55 tire- 16" Max GCWR- 11500 lbs
gear- 3.55 tire- 17" Max GCWR- 11000 lbs


Just a side note. If your expy does not have the tow package, be careful when towing a great amount. Ford recommends a aux. tranny cooler be installed. If you don't do but occasional towing, I would change tranny fluid a little more often. The tranny runs hot anyway, breaking down the fluid and towing would only increase this.