I had the complete set of gears swapped from a 200 johnson 2001 into a new gear case purchased from the dealer.Everything seemed fine but after a few times out I felt a funny bump like I hit something in the water.It has happened a few more times so it's not something in the water.Someone told me that it's the clutch dog and soon the lower unit will be wiped out .Is this right .I hope someone can help with this problem.Thanks