Swapping out one of the 4:1 planets for a 3:1, increasing speed some. Trying to get up to 30 mph (1:1 scale) speed. Forget if I ever greased the other two planet gears, well it's apart so might as well clean and regrease. So I should end up with tranny being 3:1,3:1,4:1 then diff being 3:1 gearing reduction.