TH 350 question

Not knowing much about the internals of the TH 350 transmission, I have a question. In the act of changing the fluid in my trans, I notice particles of bronze material in the trans pan. I'd just like to know what components within the trans might be suspect? I think they (the particles) may be from a bushing or thrust washers of some sort. What say you?

 

Bronze is usually thrust washer but could be from bushings

 

Thrust washers usually, may be bushings, unless there is a bunch don't worry about em.