Only the rear suspension on the Expeditions is air. You should get more than one inch of lift out of it, have you put any kind of load on it. I can load mine to the point that the trailer hitch is on the ground and it will pump back up to LEVEL ride hieght. Beside that if the air bag or one of the fittings or lines happens to break, you can still drive it but the rear will look like a low rider and the front will stay normal. If this does happen on the passanger side of the front floor board just under the dash ( it's kinda hard to see but reference your owners manual) you will find that their is a on/off switch that is labeled air susp. Make sure to shut it off so it does not burn out the compressor. Also if you take it in to get new tires make sure to shut that switch off or tell the shop that it has air ride, if not when they put it in the air the compressor will continue to run until it BLOWS the air bag. When this switch is in the off position or if their is a problem with the system their is a light on the instrument cluster that comes on says CHK SUSP. If you decide that you do not want the air ride, they do sell kits on ebay to convert it over to regular coil springs, but in my opinion the air ride is the way to go. The ride is much smother and again if you tow you dont get the rear end squat that you see most with. It makes it alot safer for towing.