Well that is very good info. Being I just installed the motor, I was a little worries that there was something that I could have done to cause it? At best what I can describe it as is black maybe plastic/graphite pieces. They were running it hard right before it stopped. I have never done a k21 install so the help is golden. I have never been in the transmission on the Nissan family so that is why I am asking about the possibility of the "plastic". I will pick up a couple filters, a valve body gasket and a couple gallons of oil.