Time to mod the Trans?

[Farmertom390]

Well my tranny is running good and shifting fine for now but I would like to do something to it to keep it that way shortly. My mods are in my signature and injectors are coming soon so what and who do you guys recommend. Or is it better to just leave the stock trans alone for now and just save the money for a new trans to replace it? It is not the original transmission but i dont know if it is all stock or not