You should be able to remove them without having to jack or lift anything. Replace the mounting studs on the frame side along with the shocks, always tighten to factory torque. If you find any cracks in the frame, repair as needed. Whether you have cracks or not and regardless of whether it's 2wd or 4wd, I recommend installing rear shock mount frame brace brackets. I used the kit from ORD, high quality and worth the effort and not terribly expensive. Cheap and easy insurance against future frame damage.
This is said brackets installed on my truck, came with quality Grade 8 hardware.
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