Your gear oil is straight 90 or 80w-90. Toyota have one 75w-90 but more expensive...
Manual got no gear oil filter and no dip stick because fill until it leaks out is full....
My gear oil is 80w-90. Chemlube don't have 75w-90 and it's expensive for 80w-90 fully synthetic. I bought it RM75 per quarts.