parts that are the same are

engine cradle
engine mounts
front and rear diff
rear driveshafts
front driveshafts are longer but will work fine
front and rear prop are the same(only early 2.9 and 2.8 used a skinny front prop)
rear beam will be ok, only difference is hubs are taller and bushes( fine if you go cossie hubs and poly bushes)
abs pump is the same