Come on now man. You're nearly 10 posts in.
You should already be aware that we as a collective require more information on what's really going on or we're just going to have you grasping at straws till you find something.
But right off the bat. The bottom ends fail from coolant getting into those bearing usually caused by BHG. But that's just one of many things it could be. If that's even what you mean.
