2010 4RUNNER shifts to higher gear at slow speed; 5th gear at 25 mph

What is your question?

My 2010 4Runner shifts up to 5 th gear when I’m at a slow speed, 20-30 mph. The engine bogs down as you would expect when going to slow for the higher gear….like when you fail to downshift when driving a manual transmission and you slow down. I have to gas/rev the engine to get it to downshift. It started doing this at About 120k miles. I had the transmission fluid serviced, but didn’t help. If I use S mode and manually shift, it seems to work fine. This only occurs if I’m in Drive mode. The engine light is not on, no dash lights are on.

What makes this problem better or worse?

When the engine is bucking, if I shift from drive to S mode, it shifts down to 4th gear and power is restored.

How long has your 2010 Toyota 4Runner had this problem?

6 months or so…my mechanic says it’s fine, but I need to drive with him to point out the problem