Toyota 2SDK8 SDK8 Skid Steer ATF, Hydraulic, Diesel oil Fluid Recap, Part 4

Today I drain and refill the hydraulic system and look into the left and right reduction gear units. Later today I pressure washed everything inside to remove 30 years of dirt, mud, and oil.
The hydraulic system calls for 6.6 gallons of ATF Type F along with a 0.5q of mysterious lubricant, Toyota P/N 38999-42800-71 that I can't find any information on.
The gear reduction units are 4.2 gallons per side. Mine were still golden yellow so I didn't do anything with them yet.
Wheels: 16.5" x 8.25" with approx 4" offset
Replacement wheels: www.solidtiresandtracks.com/16...
Tires: 10x16.5"
Someone didn't replace the lug nut studs correctly so I ordered a new set of 32 lug nuts and 6 studs to replace the wrong sized ones.
Lug nuts:
www.liftpartswarehouse.com/pr...
Studs:
www.liftpartswarehouse.com/pr...

[@user-zc8kf9ri7f]

Hi, I have an SDK7, drain and fill plugs on the sides are for the transmission? Do you know if they take the same type F fluid? Before I crawl under, can you let me know where oil drain plug is? Thanks!

[@LILEVO]

The plugs on the sides behind the wheels are for the chains. The gear reduction units are 4.2 gallons of motor oil per side.