I'm doing this very thing to my saph at the moment.

The way I'm doing mine is by leaving the front suspension setup the same by utilising the front outer C.V. joints but with the joint 'socket' machined off to keep the front wheel bearings from collapsing.

You will need:

Gearbox,
Propshaft,
Speedo cable,
Gearlever and all the trims,
A special gearbox mount cradle from Ford and mount (allows a 2wd box to fit into a 4x4 shell. A 2wd cradle won't fit. I will try to dig out the part number.),
2wd sandwich plate (goes between block and bellhousing),
Possibly clutch cable (not sure if 2wd and 4wd are the same),
2wd rear beam, diff and shafts (could probably use 4wd stuff but don't know how strong they are),
2wd starter motor,
2wd release bearing,

Obviously you will need to take the front shafts and diff out but I can't see any reason why the original sump can't be used.

That's all I can think of at the top of my head.