You just need to start sanding and give it a smooth finishing with 800-1000 grit or more. Harbor freight has real cheep polishing wheels with rouge and on line you can get drill attachable polishing doo-dads to get in those tight areas. Some areas you just can't get perfect. Disassembly of the tranny is not required but makes it much easier. It might be a good time to go through it while it's out,I did. It is not hard to do it just takes time. In some sick way enjoyed it. If you have a ton of money just take it to a pro. I try to do as much as I can myself because poor boys have poor ways.