the trans you have in 560sel is easy one to take out if you have access to lift if not then watch out it is heavy.reverse has its own set of clutches they can be accessed by taking off torque conv remove front pump carefully pull out front drum then by moving the pins on the front band you can get it out and there is the reverse cluch pack.soak the new clutches[4]in trans fluid before inserting.you also need access to compressed air so that you can air check the reverse piston that comes out of the front pump.sometimes it comes out at an angle if the seal leaks and can be cause of no reverse.good luck, david poole e. p. dallas texas.