Easiest thing you can do is go stock.
Someone on here can get you all the correct parts, and it will all bolt on.
As for the trans, you may save some money if you pull it yourself and drop it off. But a trans shop should be able to diagnose it before any work is done
Also you can pull the pan and do a filter / fluid change. With the pan off you can look for spare parts in the pan that should be in the trans:rolleyes: