I'm over 175,000 miles and feel like the last few years the shifting is only so slightly too long or delayed for the first shift or two. What are the warning signs on our cars to get the trans looked at? High miles (this seems obvious)? Check trans fluid? Stuttering or sudden shifts?

Just wondering if I should wait a few more years, lol (to get more out of my current transmission since it is probably fine for so many more miles), or if I should take it in and prepare for some damage to my wallet. ha ha