Is my 904 toasted?

Alright, I adjusted the band - and it took some serious adjustment. Once I was done there was only a couple of threads sticking out above the lonck nut and it wasn't that deep before the adjustment.

But... no change. Still shifting into 2nd with serious slop. I didn't juice it in 2nd to see if it would slip because I don't want to end up breaking it completely.

The car is just a basic cruiser with a couple of trips to the track each year. I'm making maybe 300 HP at the crank.
Assuming it is toasted, does anyone know what I want to get for a rebuild kit?