I just lost the bottom end in my 01 due to a key on the primary gear that broke. It took out everything below the valves including the clutch case. All the gears on the right side of the engine are in pieces, the balancer hit the the rod, the rod bent the balancer broke. The clutch basket exploded, oil pump water pump all gone. I will be spending the $$$$$ for a falicon and it will be balanced with knife edges. I am looking for someone to cryo treet all the keys before I rebuild. What more can you do to bullet proof your engine? Why don't they do this at the factory, build something that really works. We had enough problems with the 01 trannys the starter clutch now this. I love my Raptor but a guy can only take so much.