I am in the process of making the mod to the reverse shift fork on my T-56 tranny. In the process of taking the fork out, I noticed something had come aprt with the reverse synchro. There is a ring inside of it that is now in multiple pieces. It is not made of metal, but seems more like some sort of plastic or fiber. I'm hoping someone can tell me what the part is, so I can see about getting a replacement. I've included a picture which shows the broken piece.

 

So I guess I have stumped everyone on this one??? Almost 100 views, and nobody knows.

 

Found my answer elsewhere...it's a thrust washer.

 

Yep. #74 in the Tremec manual.