Never had a transmission problem until a 21 Chevy 2500 was bought. It makes a horrible noise at times. Started around 120k miles.
You are lucky. I have had several go bad way to early. Of course I tow a lot of trailers and boats too. I keep them serviced regularly too. Mine started acting up around 70k but was told there was nothing to do but get it replaced. I drove it as long as I could this time until it got so bad it couldn't be driven.
