Ok Engine # 6744710 Leg #6742325. Last week was out on st clair river after my carb rebuild testing things out every thing went great boat runs strong. The next day my nefew and I went out every thing is great at the end of the day we head to the boat ramp and about 300 feet out in 38 feet of water I hear a load banging noise like I hit something but no way not in 38 feet well the noise got worse by the time we made it in. took it home pulled the drive hopping it was a ujoint but nope.So poped the top cover off the upper and sure enough the gears are toast broken teeth! Now I had recently replaced all the seals in the upper and lower during the restoration on this boat. All the gears and bearings looked fine at that point. There was lots of oil in the top but looked a little milky would that cause the failer any insite on what I could have done wrong Or what mite have happened? Thanks PHIL Sorry 4 the long post! Also I didn't use marine gear lube I used a good quality 80w90 hypoid gear lube did this trying to save 20 bucks just cost me 1500:facepalm: