It'* gonna cost a bit for one. And You will only get one shot. You'll need to get an idea of how much to shorten it? And what the length taken from the rod corresponds to in length dropped. I'm really interested in this and if my ELC system was intact, I'd be out on the ground playing with that lever.
And wondering if the OEM springs can be left intact. My Park Ave sat pretty low after sitting in the back 40 for awhile without a Battery in it. I am wondering though, if the rear shock will have enough throw left staying as is, and if running on such low pressure will give you adequate stability and ride. How far are you thinking of dropping the car?