I know this sounds stupid, but I need to know the serial of both motor and trans on my truck, as far as I know it's the orig motor and trans but I am about to have them both swapped out.

I want to know the serial of what's in my truck now so once he is done I can verify that the swap did in fact take place, more worried he may try and fix issues and then say he swapped.

Any ideas?

 

Crawl under and put a scratch someplace on the block and trans housing that only you know is there. A dab of paint maybe.