I have an 02 F350 which I pull a 37 ft 5th wheel RV trailer with, besides the "normal" farm trailers. I believe the tranny in mine is the 4R100, supposedly an upgrade from the E4OD which I think your truck has. It has a drain plug in the tranny pan. The book says to use Mercon 4 as the tranny oil, and NOT to use Mercon 5. A few years ago the Mercon 5 was reformulated to work as an improved oil replacement for the Mercon 4, and the Ford dealer recommends it for my truck (and maybe yours too??). Mercon 5 has better high temp stability and that may be a good thing in your Texas summer heat.
Under no circumstances would I let some shop back flush the tranny and cooler lines. That process sounds good in theory, but statistically leads to a high level of tranny failures. I do use the OEM Ford tranny filters (screens). They do not cost too much and have been improved from the original ones. There is a donut shaped magnet in the bottom of the tranny pan to pull metalics out of the operating oil. And for that reason, I drop the tranny pan at the 100K mark and replace the filter and clean any particles from the magnet and bottom of the pan. Unlike older trannys, there are no bands that need adjustment, so the job is pretty simple.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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