Did you count the splines on those RCVs? Last I knew they didn't make 35 spline for the rubi 44 LJ/TJ. Only for the JK rubi 44 did they offer a 35 spline RCV. Unless they were custom made?
I pulled my rear axle apart to replace the pinion bearings. I had about 3/16" in and out play. Looks like the pinion was shimmer in the wrong spot which destroyed the shims and bearings.