Rearend Rebuild, Need Help

I see you said you replaced the bearings. Are you able to get the front bearing in all the way? Reason I ask is I just did this on a 742 case and I had to press the front bearing on cause it was super tight fitting on the pinion. There was no way I could get the yoke on without pressing the front bearing on first.

Mine was a 10 spline and it had evenly spaced splines so it didn't matter which way it went on. If that was the case with yours you wouldn't even get it to start at all.