wiring

I have a 99 cummins. recently was in accident and had some front end damage and had to replace some parts on the front end. The transmission was fine before and now its not. I took it to the dealer and they said i probably missed some of the grounds under the hood. They have a tendency tho mess with the computer which causes the tranny to be funny. If anybody could get me a list of the grounds or let me know where some of the major ones are that would be awesome so i don't have to spend the 500.00 at the dealer. Thanks