Play in gearbox output flange

[drillmaster]

Hi all thanks to the reply in my previous post about gear oil in the cv joint ive now replaced them and decided to do the rear wheel bearings too while the shafts were off, so far so good.
My question is regarding play in one of the gearbox output flanges, I'm guessing about 1mm in the vertical plane. I noticed it while working in that area. Is it ok to leave this and if not how do I fix the problem?

Thanks in advance.

[Aidan]

is the seal leaking ?
is it nearside ?
if no and yes don't worry about it, pretty normal

[drillmaster]

Yes its nearside and not leaking. Thanks!