sump
gearbox
prop
gearbox mount

everything else can stay as it is if you ditch the driveshafts and prop you won't need to change anything else

if you DO decide to go with the 2wd stuff you'll need to change the hubs and struats and arb and crossmember and steering rack and intermidiate shaft too, lots of work when you can grab a granny sump and hunt around for a front casing for a 2wd gearbox to bolt your V6 front casing too