Sorry, I raise my rear end up by putting my 3 1/2 ton jack under my diff. This will raise the entire rear end with the suspension as it is when it's sitting on the ground. Then I have to put the chasis on jack stands then lower the massive jack, then it will "drop" about a foot.
If you jack the car by the chasis, then when you lift the car, the suspension will uncompress. You don't have to worry about "dropping" axle.
If I need to go into further detail, just let me know.
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