For the 8-speed guys, the desired rear end ratio is going to be different. They start with a 3.307. The two or maybe 3 relevant ratios are 3.9s (+10%), 4.1s (+24%), and possibly 4.3s (+30%) for the seriously big tired guys. IMO, 3.9s would be the preferred re-gear for most, as that'll get back to better than factory gearing with even 36s.
Compared to 6-speed that starts with 3.9s, 4.3 (+10%), 4.88 (+25%), 5.29 (+35%).
4.3s on an 8-speed would be like dropping in 5.29s on a 6-speed.
I would say the 8-speed guys should be able to more easily source ratios and pumpkins. Either the factory front and rear pumpkins out of pre-2016 cruisers. Or the standard 4.1s found in 90% of tundras and sequoias. These would come with the necessary front housing to support aftermarket lockers as IIRC, the deck height of the 3rd member in the post 2016s were different, and not compatible with aftermarket lockers.
View attachment 3074925
View attachment 3074926
This!
We are doing quite a few 16+ 3.90 regears as of late. We keep the complete diffs in stock, open or ARB locked.