My ‘96 F250 7.3, auto trans, is completely happy around 65 miles an hour with any load I could put on it, or 70 or maybe 75 when it’s empty. The motion is effortless.
One time I pushed it towing a car on a trailer up to New York for my kids, and bringing an old car back. It was a bigger equipment trailer, not a not a light car trailer, and the Mercedes were both maybe 4000 pounds. I was pushing it like 75 or 80 most of the trip. And let me say it was always meticulously maintained.
This was when I had about 75,000 miles on it. After that trip, it wouldn’t shift right. after going to the regular Mechanic guys, I finally went to a transmission shop that oneWhat of them recommended. Apparently when you push them like that, there is a little pin that has to do with the shifting pressures and actions, and the pressure on that pin will hollow out the hole it’s in. So my clutches, etc. we’re all fine in the transmission, but I had to have the transmission rebuilt because you can’t replace the piece that has that little hole. A hard lesson to learn.
One of the nicest things about retirement, is I don’t have to be in a hurry to go anywhere. I drive fast, but not as fast as I used to. I don’t nurse the vehicles, but I no longer push them either.
Just an FYI for anybody. A lot of times, any kind of equipment works fine if you keep it under 90% of its max performance. Once you start going up in that range, they just ain’t gonna last too long!