I have rear output shaft housing gasket leaking--yes, the gasket; not the output oil seal, as I put in a good light, got under vehicle, and examined it carefully several times over a period of time, and found a slow dripping coming from the output flange housing gasket joint at bottom. However, since I am going to replace the gasket, and use good gasket sealing liquid, I will also change the oil seal, since the drive flange needs to be taken off anyway. Questions: a. Anyone know what size, mm, that nut is, the drive flange nut, behind the drive shaft u joint? b. To get the rear output shaft housing off, I do need to take off the drive shaft u joint end, at the emergency brake housing, and tie it off to the side until I finish job, and I DO NEED TO REMOVE THE BRAKE DRUM AND SHOE ASSEMBLY complete, along with the dive flange nut, and drive flange, to get to the output shaft oil seal, to pull it out, and install new oil seal, then I need to remove the output shaft housing, to change that leaking gasket, CORRECT--if not correct procedure, please give me correct procedural method?