I bought an 02 SuperCrew FX4 5.4 from an in-law with 130k on it, it towed a camper and a boat. All the routine maintenance was done except for the transmission. Yes it raised some concerns for me, I looked at the fluid ( the white paper towel method) and it was acceptable. I had a B&G flush performed (cleaner and flush) after having confidence in the truck overall. I put almost 70k on it, occasional towing, since then and the trans was still solid as well as the engine. Other issue have parked it, rust, exhaust etc.
Heat kills an automatic transmission, keep that in mind.
Heat kills an automatic transmission, keep that in mind.