[Raptor]

Did you get some better fluid in there? I am not at all a fan of GM Synchromesh. Not that it had anything to do with the metallic chunk collection in the fluid, but definately worth changing. There is really no question as to where the leak was. The drivers axle seal is definately the culprit. Not sure what I would suggest you do about the metal collection in the fluid. Maybe after the new seal are in and the fluid is changed, check it again in a week or so and see how it looks. Maybe some of that is from all the trouble they had getting the axle in on the passenger side and issues with that retaining clip. If there is a new collection of particles in the fluid at that point, maybe have someone who knows trannies better check it out and give you some options. I don't think it would be good to assume disaster and pull it for rebuild right away. Maybe someone with some more tranny building experience can chime in on this and help out with some useful advice.