you can leave the sump fitted just cut the passenger drive shaft surport lightly to fit the starter motor in. you can leave the front hubs just put the ends of the driveshafts back in to hold the hubs together. you can leave the clutch cable,
get a 2wd gearbox,2wd clutch release bearing,2wd flywheel,2wd starter motor, gearbox mount, 2wd prop and speedo cable job done about £450

the 4x4 diff is fine there stronger than people say. i'm still going on mine and it takes 440bhp flat out in second gear no probs

hope this helps