I have a 1999 F150 4x2 with a 5.4 and a 3.55 rear end . I want to pull a 5th wheel that is 5000 lb. loaded . I am going to install a aux. trans. cooler but was wondering if i might need a larger radiator i just have the single roe of cores i know they make one with two roes of cores. Thanks Don

 

If you don't have the factory towing package, you might want to look into buying those parts and swapping. The 5.4L with towing package comes with an auxilary engine oil cooler, as well as a tranny cooler.

 

Do you know where the oil cooler is located and how the lines are routed? I've seen the oil cooler on the older expeditions, but they also had a remote oil filter. I'm curious how its mounted on the newer trucks.

 

Oil cooler is mounted in front of the radiator, low and forward. It is tilted to catch air from a lower point. The oil filter is mounted on the cylindrical fitting that runs the oil to and from the cooler. The fitting is on the driver's side, front corner of the engine, and low.

 

5000lbs is kinda of light for a 5th wheel trailer isn't it?
My wood bottomed 24'(20ft plus 4ft dovetail) car trailer holds up to 7500lbs and probably weighs between 1200 and 1500lbs. The most I would tow is about 6000 lbs, but mine does have the tow package.
I was just curious about the 5th wheel part. Most 5th wheel trailers are pulled by F350 Duallys that I have seen. Jimmy