Initial inspection of A500

Looking at the top of your third pic, I see what looks like a lot of trash in the bottom of the pan. If the clutches are scorched, they aren't for long in this world. The mistake most beginners make is they take the whole damn thing apart to do a "super duper rebuild". Just drop out the pump and front drums. Don't take the pump apart; just replace the front seal, pump gasket pump oring and the gasket washers on the pump bolts. Don't take the pistons out of the drums; just replace the frictions. But before you take it apart, pull in and out on the input shaft and see how far you can go in and out. NOT side to side; loose is normal there. Say if it's like 1/8" no biggie, but you could replace the little fiber button on the front of the mid shaft with a thicker one. Lots of suppliers furnish thin frictions for the forward clutch(the back one) and thicker ones for the front clutch, but you want all thins.