I broke another prop shaft (B-Max upper with Imco lower) last weekend and when we pulled it apart today, we found that the lower gear set was munched also. This is the second time that both the lower gears AND the prop shaft went at the same time. I wasn't even on it that hard when it let go this time. I'm wondering if over time the lower gears start to get munched (from hard running), then could possibly create some sort of vibration or harmonics that could cause the prop shaft to break. I'm thinking that I should PM the lower gear set every 50 hours or so to see if they are starting to get "munched" and if so, change them before they possibly cause the prop shaft to break. Could I be on to something here or is it just a coincedence that both the lower gearset and prop shaft have failed together twice now? :idea: