Based on the phrasing, it sounds like you might be looking for communities or platforms related to either automotive repair or personal fitness/physique for the transgender community. Because "tranny" is a slang term used in both automotive circles (shorthand for ) and as a slur/self-identifier in the transgender community, here is where you can find "rate my" content for both: Automotive (Transmission Valve Bodies)
If you are looking for "rate my" content regarding within the transgender community, there are several social media trends and subreddits dedicated to sharing progress. rate my tranny body
If you are looking for feedback on a rebuild or repair, automotive enthusiasts often post photos of their work on specialized forums for critique on technical execution, such as gasket sealing or component placement. Based on the phrasing, it sounds like you
: A common place where users post photos of their transmission pans and valve bodies for "rating" by professional and hobbyist mechanics. : A common place where users post photos