MoJ
Moderator
My .02....Mark it! So later when you’re chasing a vibration you know the baseline from which you started.The orientation of the front flange of the differential to the rear flange (front of the transfer case) makes absolutely no difference.
The only "phase" that you need to be concerned about is if the front yoke of the DS to the rear yoke of the same DS. It's 90' out of phase for the front and in phase on the rear. This is only if you disassemble the DS itself.
The slip yoke of BOTH DS is to the front by of the vehicle.