A few years ago I traded in my worn our air suspension for a rear conversion kit from a place called Strutmasters.com they were very helpful and there kit fixed all the problems I was having with my rear end sagging. The kit also came with instructions on how to disable and install everything. I added the link to the part I got below.
http://www.strutmasters.com/Cadillac-Deville-Air-Suspension-Rear-Conversion-p/-cad-r4ns-mnt-d.htm
I hope I was of some help
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