transmission fluid flush question

[hliu42]

Has anyone got major problem because of changed or flushed the gearbox fluid?

my car has 176000kms on it, but I never changed the fluid. I know this noob question has been asked million times. but I did research, all answers like 50:50.

I get information from Gear-Matics in Melbourne. the boss explain to me the "life time" means the period of warrenty, after warrenty, it is no more life time.

and he told me few days ago they rebuilt a e53 gearbox for $5000.

so what I m thinking is i m not too sure if they know what they are doing and what they have to do for my car. i want to avoid problems before I spend hips of money to fix.

so please, if anyone has experience of transmission flush, please let me know how it goes?

thanks
Hong