Seen a post on here about using a speedy sleeve? or something.
Maybe they will see this and give more info. Gives a new surface for a new seal to run on, surprised its not talked about more considering the problems we have with output shaft leakage.
I've done it on my RRC one.
It was quite a while ago & - so far - no leaks.
Used them on other things incl the crank pulley.
There was a very good 'how to' done by someone which I followed which gave the size of speedisleeve you need but unfortunately it disappeared when the photobucket started charging people a subscription for storage
Can be done without stripping the box, but it's much easier if you take the box off the car & do it on the bench/in a big vice.
Measure the depth of the old seal before removing it then remove it, fit the sleeve & the new seal kit.
You don't need to peel the lip off the sleeve, I didn't, but you need to seat to depth to take that into account.
You will need a length of tube as the fitting thing that comes with the sleeve isn't long enough.
Found this on another site & it links to the old LRO forum and a post by dieseldog who did it by stripping the box. Photos don't work, but it gives the size: