you need to find a 2wd granada then to start with. pretty much all the parts are there.

Well pretty much all of the 2wd granada bits will go straight onto a saph.

Drop the lot out from underneath (rear beam, box, front x-member, arb, engine, rad etc..) do same on the saphhy and bolt it all back up.

Keep the loom from the granada and get a decent sparky to wire it in for you (bit complicated to do it yourself unless your very handy with wiring)...I can reccomend someone if your in east mids.

using the full underside of the granada means you get a LSD in the rear and the conversion can be done in a day by a competent garage.

Cheers
Dan