fully sealed unit.
I am still trying to find the write-up on it ... i am sure GK wrote it. Might have been Ronwest though.
Can get them cheap $80 each side) from
www.ozeparts.com.au as well if you need to find them.
Need to get the centre bolt off though ... it's a large size from memory ... so may need to get correct size tooling from a parts store.
I'll try and dig around as I know someone else was asking in the Servicing your AU section as well.