Since the later versions of the e53 come with a friction plate center-diff that apportions power using an electric motor, has anyone thought of retro-fitting this design to the older trucks and using an on/off switch to engage?

You could even use a rheostat to manually control the split.

My question isn't the wiring as the older ECU won't even know its there, but whether they will bolt up or have a different pattern - mine has the GM transmission and I don't know if this is a feasible swap.

cheers
Ken