A GM dealer can tell you if you give him the VIN number, but the simplest way is to check one of the rear struts for an electrical connection (will also have a leveling air line connection). If there is one, you have a road sensing suspension (RSS) with rear leveling capability - if not, just air shocks. If you have RSS, these struts are very expensive and notoriously unreliable, and you may want to replace them with air shocks. However, if you do this you will have to trick the RSS into thinking they are still there by terminating each electrical connector with a resistor (see the Cadillac Forums website).
SOURCE: 2004 Chev 1500 Suspension bounce/jiggle
There is a Service Bullitem out for that year (2wd) because the front frame cross member needs shims. I had it done to my crew cab 1500 a couple years ago, but the noise is back now :/
I'll look for the SB# a bit later. Good luck.... should still be covered, I think.
Don G.
SOURCE: 2004 caddy deville dhs suspension
One of the irbags must be licking. My (02) was doing the same thing and I replace the shocks and problem ws resolved. However, my car looked a little low before the shocks were replace. These shocks are very easy to change and new ones cost me $240
SOURCE: Rear Suspension on 1996 Cadillac Deville
you may want to buy regular heavy duty shocks and put on the car to raise the back up high enough to do what you are trying to do.
SOURCE: Message on dash 96 deville service traction control
check the brake fluid and make sure caliber is full of fluid. mine said that and it was because fluid was low.
SOURCE: suspension is really loose, ride is sloppy like it
Yes it's the shocks. They have an average life of 80,000 miles so replace them with life time replacement at Parts Source and don't buy the cheap ones, they don't work well and since there life time replacement parts. Spend a little more for the good ones, just keep the receipt in the glove box in your manuel. Good luck and hope this helps. you can change the shocks your self with common tolls.
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