Recommendations for 2nd gen tundras diff and transfer case oil

I keep hearing mixed thoughts that front and rear diff require 75w-85
transfer case 75w-90
interesting in hearing other 2nd gen tundra owners thoughts on what they have been running if they use 75w-90 for all 3

found this deal on Amazon 80$ for 8 quarts of 75w-90 valvoline

$54 Valvoline Flexfill SAE 75W-90 Full Synthetic Gear Oil 1 QT, Case of 4

https://www.amazon.com/dp/B08K9CGB6Y

 

Use Ravenal SAE 75W in the transfer case.
Front and rear diffs use 75W-85 or 75W-90 full synthetic of your choice. Valvoline is fine.

 

Depends in the year of his truck. Older transfer cases used 75W-90 gear oil. I think the newer TC came in 2014 or so.

Those ez-fill containers that Valvoline uses are great and refilling the diffs is much quicker and easier than using the hand pumps.

 

When I financed my used 2008 Tundra 4WD 5.7 with 153,000 miles I took it to the dealership for the Front/Rear Transfer Case this is the following info on my receipt:

Installed 7590 Gear Oil 16@4.95 = 79.20
Installed

$15 12157-10010 Toyota Oil Drain Plug Crushable Steel Gaskets Set of 10 OEM 12157-10010

12157-10010: Gasket, Drain Plug 3@2.68 = 8.04
Installed 90430 - A0003: Gasket 2@3.08 = 6.16
Installed 90430 - 24017: Gasket 1@3.40 = 3.40

All for $149.95

Had more things done cuz I didn't know what the other owner did or didn't do and as of now at 185,000 can hear a thing and the engine gears are running all smooth
On top of it they let me inside the bay pointed out everything and showed me the parts so at least to me in this instance I felt like they did care

 

I use 75w90 full synthetic in all three for my 2012. Usually go with good ol Mobil 1, but they didn't have any when I last did the transfer case. It currently contains the purple stuff.

Aisin transfer case calls for 75w90

Borg Warner (2014+) wants straight 75w