[Vwpickups] gearbox woes

[MILLER S.H.T.]

My pickup has dumped a load of oil out the gearbox. I have degreased and
pressure washed the whole engine bay, and I can see that the gasket
between the bell-housing and the rest of the gearbox seems to have
failed. (It is the big gasket that goes around the differential, and the
bigger of the two papery gaskets. I'm struggling to find its Proper
Name, as I'm sure it will have one). The leak has gone from a minor seep
to a major leak very quickly. I can see the oil coming out and dripping
down. I have thoroughly inspected the outer casing and I cannot see any
damage, so I don't think it is a case of the self-machining differential
problem from VW's cheapskate rivets.

I haven't got the time or the facilities to drop the gearbox and replace
the gasket. I've also not done it before so I'd be at the bottom of the
learning curve, so I will have to take it to a repair centre. I am
getting some quotes from clutch fitting centres, as I will get a new
clutch at the same time.

OK, I know this is a FAQ, but silly me, I have never retained the
information...

What are all the 'extras' that should be done at the same time.
Obviously I will need a new clutch and gearbox gasket/seals. Apart from
seals on the gearbox itself, what others are essential to replace, and
what other bits and pieces that should be done while everything is
apart? I'd like to be able to ensure that the mechanics replace all the
bits necessary so it doesn't have to come apart again in the near
future.

Regards,
Scott