Got around to swapping on the new arm and blade. Old arm didn't want to come off until I gave it a couple taps with the handle of a screwdriver and then it popped right off.
Looks like the old wiper arm splines were stripped.
Looks to me like there's metal in the splines from the arm itself. That should clean out with a pick.
Yep it’s part of the old arm itself. I think GM makes the arm out of weaker material so it sacrifices itself instead of sacrificing the expensive parts. Kinda like the bolt on the side post batteries. The threads in that will strip out before the threads in the battery. Hope that got cleaned off before installing the new one.Is that anti seize all over the splines?