Problems with Jeep DIsc conversion??

Has anyone at all had problems installing the 95-99 Jeep GC rear disc brakes on their A-bodies?

I was getting ready to order axles for my 29 spline upgrade from Doctor Diff, and he indicated that he has heard lots of people having issues with the conversion. I want to make sure I am not going to have issues before I order these axles. The plan was to order them with the smaller Jeep centering register to eliminate the need to grind out the rotors.

Anyone?