After gearbox has drained before you start task jack up left hand side well so any remaining oil will flow into gear box away from joint you want to seal.All that as well... I used red thread lock on the bolts but I did tighten it straight away. My wrench only went down to 25nm so I guessed it by hand [emoji849][emoji17]
I'm not doing the box so I'll just have to leave the oil to drain. It's not being used so I could leave it draining a few days
Brake cleaner spray will degrease surface and evaporate quickly so handy prior to using rtv