Originally Posted by Drg racr
I'm guessing here, but could this be a result of vibration? There's spots on the main and rod bearings that are down to the copper.
Still, what would make it knock? How about the harmonic balancer or the torque converter?
Hopefully someone else will post up here, as I'm not a genius when it comes to internal stuff...I can tell you basics, but diag wise I'm not an ace (but not ignorant either).
I would think that, over time, if the motor was severely out of balance that it would cause excessive main bearing wear. However, I really can't see it causing uber bad rod bearing wear........like I say, hopefully someone will pipe in here