I have a 2000 4x4 with a 5.4 and a 4R100 automatic transmission. I got it used and it had a tow package on it. How can I tell if it has a OEM tranny cooler as well?

 

Trace the fluid lines coming out of the trans.
My '97 has them going to the radiator then to a seperate cooler in front of the radiator.
In fact I have two seperate coolers in front. One is for the trans and the other is for the power steering. I also have the factory oil cooler, but that's part of the cooling system (water).