dont think really good idea to use the diff as the point to jack up the car...there is a centre point just in front of the diff to jack rear up..if car is too low then...drive on couple pavers to bring the car up abit....I did my G/B oil with ramps to the front only, thought about jacking the back up and using stands to level but didnt need too. 4 stands is the go and have a jack or 2 in some key points, pre load it abit, just in case something does happen to the stands the jack/s will take up the weight