It's amazing even after 45 years of getting dirty, I'm still learning new things daily. On transmissions, sadly you end up tearing into the innards, or replacing with a reman. Sometimes you get lucky with just an electrical part, but not often. Their a complex unit, that requires dilagent maintenance, which most don't do. Letting a transmission go 150k on same fluid, while towing too, is suicide on these units. Very few vehicles have the capability to tow an 7,000 pound trailer, for extended lengths, but individuals do it, because the owners book said so. You will rarely see a vehicle that tows regularly without add on coolers and such make it past 100k on their transmission if that long . Ideally a manual transmission with a fairly stout clutch, would be a nice option, but Ford stopped those years back. Tow trucks that lasted had just that combo. Replacing a clutch is under $200.00 if done yourself.
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