LT230 to LT77 seal help

Hi guys

Just about to start bolting my transfer case up and was wondering if it's just the two oil seals that create the seal or is a gasket needed?
The guide I've been following doesn't mention it but defo seems like there should be one?
Had a look through the old threads but found nothing definitive and I don't really want to mess this up!

Cheers

Oil seal on box and lt230 are all that's there I iirc but a smear of rtv on mating faces won't hurt as long as you avoid drain channel

Thanks mate much appreciated!