4L60E 3-4 fiber plate wear
 

Howdy all! New to the forum. Hope ya'll are doing well and runnin' on all cylinders... Got myself into something I really wasn't ever looking to do, a 4l60e rebuild. Upon disassembly of a supposedly recently rebuilt 1999 4l60e, I came across worn engagement cogs on the 3-4 fiber plates. Everything else appears to be in pretty good shape. Any ideas on what would cause this kind of wear? See pics. Gracias!
https://cimg8.ibsrv.net/gimg/chevrol...337414138b.jpg
https://cimg1.ibsrv.net/gimg/chevrol...6d8956adae.jpg