I have a parts manual but don't have a service manual and am looking for help on the mmm gear box lube. How much and what weight? It appears to have two fill bolts at the rear of the case and I would think that the top one is for filling and the bottom one is to indicate the correct level but really don't know so am looking for help. Anyone know the answer. I've gotten so much help just reading on this site and thank everyone fo rtheir input.