I usually do mine by a left right instead of the differential, but thats just the way I do it. I am not sure if it is better to do it form the center or the sides.
If it was my jeep or my other cars I had that had tube differentials, I would do it form the center.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.