I already have the Rubi 4.10's for the locker. I believe the problem is the amount of space in the housing where the bearings sit. IIRC the Rubi D44 is wider, thus requiring thicker spacers. I called Chrysler and asked for price and availability for a Rubi D44 shim kit, and was told they could bring one in from the States for $660. I said "Pardon?" I later confirmed that the kit was a complete set of shims to build any possible combination, a kit that a dealership may purchase to do more than one build. I am planning a trip to the Gear Centre on Saturday to see if they can set me up with some shims that will work.
I also read that I will have to machine the surface of the bearing caps 0.100" where the head of the bolt rests to compensate for the acuator that bolts on there, otherwise th acuator won't line up and function properly.
Once (If) I am successful, I will post the necessary info incase others may need it.