I have a 96 F350 4x4 auto, 4:10 with 35" tires. Intake, Banks intercooler, tru cool trans cooler, Mag Hytech deep sump trans pan, TS 6 position chip, trans, pyro and boost gauges. The trans was re-built in 2013 and has 7k miles on it. I primarily tow a 32' 5er with the truck. On a trip into the sierras, the trans started getting hot. I expected it considering the load and the incline. That was in august of 2014. Didn't really have any issues until recently. The trans started getting hot on a trip to the desert on flat ground with air temps in the high 80s. I was able to pull over and let it cool. It continued to get hot the rest of the trip. most recently it started to get hot unloaded. By hot I mean passing 200*. I used a temp gun to check the inlet and outlet side of the trans cooler as well as the temp of the pan. The gun confirmed the gauge was right on. The temp difference on the cooler was around 15* between the in and out side. What is likely causing the temps to go up? Could the chip be causing issues? Does it sound like the cooler isn't working, clogged etc.? I haven't changed the trans fluid since the rebuild.