I've alway been partial to Fords but have owned all the big 3 and even a Mazda truck. All of them had a long life (hope I'm not jinxing myself, lol). I tend to watch the fluid in the trannys and try to flush/renew fluid at decent intervals.
My take is that any truck transmission out of the big 3 will give good service if it's maintained and a decent cooler is on the truck.
Right now, I have the Ford 4R100 mated to a 5.4 V8 and it is a decent transmission. One of the best I had was the Ford cast iron C6 from years ago. That unit would downshift at 70 mph and get me going in a few seconds.
