That's what I was thinkin, that the different part numbers were from the upgrade from the plastic sprague to the aluminum one. If that's the only difference I would just upgrade the sprague in the 2010 diff. I pulled my front diff apart , the sprague carrier, armature plate are trashed an the side cover has the copper wires showing from wear. ring, pinion, two pieces wer the axles slide in an the big side of the housing are about all I can salvage