80w vs 80w90?

I saw some gear oil on amazon that just said 80w. And it got me thinking why theirs no second number like the usual 80w90. I'm guessing their the same viscosity at cold temperature, but i'm wondering what the viscosity of the 80w is at high or operating tempurature.

2020-06-16T10:30:40Z

https://www.amazon.com/Bel-Ray-Saver-Transmission-Hypoid-99250-B1LW/dp/B0045LADMA/ref=sr_1_4?dchild=1&keywords=80w+gear+oil&qid=1592303423&sr=8-4

2017-04-11T00:37:33.809Z

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