7.1/2 inch cwp are bigger than a 7 inch cwp.but are the rest of the internals the same?ie the planet gears .are the imput shafts interchangable.any info please. also,i was talking to a chap that has fitted a bmw 740 ? rear diff into a granada.he says the shafts are the same bolt pattern,and the same distance apart.so it only needs mounting into the beam,and a modded propshaft.