It will be the same diff oils and Transfer box oils as the Lexus GX470 or AWD toyota Tundra etc , which is 75w -90 I use fully syn , auto box if 4sp (has a dip stick ) I think D111 ATF or toyota Type T- IV but not fully sure , if its a 5sp (no dip stick) they claim its life time but now tell you its 60k-100 k miles change depending how hard you use or tow with your truck its WS spec ATF I am sure on that . front diff uses 10mm allen wrench , use the socket type and make sure it is in as far as it will go tap it in with a hammer or wrench or you risk damaging the drain or fill plugs the drain can some times be tight , rear diff is 24mm hex as is transfer box, I dont know if you has LSD diffs , I dont know if my LC120 has so I used LSD 75w -90 fully syn in both diffs and 75w-90 fully syn in transfer box , hope that helps . I would use 5 w-30 syn oil in your engine , about 5.2 Litres with oil filter change , just over 3 litres in rear diff and around 1.4 in front diff and transfer box , the diffs and transfer box you just fill till it starts to pour out , auto box depending on type just sump change around 3.5 to 4 litres , I dont bother with the over flow plug on the 5sp I drain it cold at the same temp as the new ATF fluid is stored at, and see how much comes out and put the same back in , as hot fluid risers so seems more than when cold .