Please don't rip me a new one, but....

You could eliminate the front differential, cut the splines off the ends of the axles and bolt them to the wheel bearing. They are what keep the wheel bearings preload on 4x4s. The 47re will bolt up to the LA bellhousing, but you'll need a controller to make it work. As for the mounts, I'm not sure what the difference is, but there have been a ton of these swaps in Dakotas and other trucks.