tf904 front band lever removal

Is it possible to change front band lever while trans is in car with engine? I have stock size converter. There is a plug behind torque converter that needs to take out but looks like it is not possible without taking engine and trans apart.
A friend of mine
Was able to change his servo lever by using a 1/4"
Swivel and a long extension.
I'm not sure what size torque converter he has though?