Rear axle drop when car lifted.

[jlwdvm]

Is there any way to prevent the rear axle from sagging all the way down to the end of the shock travel when jacking up the car? I have a Ride Tech 4-link and coil overs in my 69 firebird project that is always going up and down on my 2-post lift. When the car goes up, the rear goes down until the shocks are extended all the way out and the springs unload.