2008 Toyota FJ Cruiser - How reliable is transmission?

any transmission problems

No I don’t . Why do you ask ( I guess you are asking but I don’t see a question mark ).

No real history of transmission problems. https://m.carcomplaints.com/Toyota/FJ_Cruiser/2008/ Of course, we’re talking about a 12 year old vehicle with an unknown maintenance history so it’s always possible.