It sounds crazy but my 2013 Toyota Tacoma 6-cyl automatic is a 6 speed.
I bought a new 86 F250 in that year. It had a 460 CID V8 and a Borg-Warner T-19 four speed manual. First gear was really low.
I did an experiment back around 1993. There was an extremely steep gravel road up a mountain to a scenic overlook. It was so steep that it was a little difficult to even walk up.
That old F-250 would climb that mountain and descend it in first gear without my touching the accelerator or brake. It would idle up the mountain.
It was a little more difficult going down. I would almost touch the brake a few times but held off.