[Larry]

Yesterday I towed a 4,000 pound farm tractor on my gooseneck flatbed trailer that weighs 4,400 pounds. I had plenty of power, but I felt a lot of surging. I know for a fact it is not the trailer, the brakes, or the hitch. I am wondering if I have the famous problem with the torque converter. I have some jerking when going down the road without the trailer, but I wasn't sure if it was the truck or our terrible roads. I have pulled this same trailer with my previous Ford 3/4 ton and 1 ton trucks without any problems. This heavy load seems to magnify the problem.
What exactly does the torque converter problem feel like?