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Originally Posted by jsbihn
RasterMaster,
Did it change the ride any when you changed over? And if you have the part numbers that would be awesome.
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In addition to the stock coil springs (GM-25956182 & GM-25956183) and four insulators (GM-15713853) purchased from GM parts direct, the only other part was an airline coupling (Gates part # G31400-0404) which was used to splice the two lines together - can be obtained at O'Reilly or other Auto parts store.
http://www.woodys-auto-supply.com/mobile/mobile-auto-part-details.asp?prod=GAT-G31400-0404
It fools the system into thinking there are still air springs installed and leaves the system in place in case I wanted to go with air springs in the future (I kept the air spring supports and bolts - just in case). Once the air springs were pulled out, I learned that where the air springs fold over on themselves, a metal ring in the middle of the bag was causing the premature wearing and leaks to develop. Also, one line had a kink or a wear spot that was causing leakage above the air spring and intermittent sagging even when the air springs were replaced.
I wanted to use the stock system for air-assisted coil springs (air bags inside the coils) but was told by the manufacturer that the pressures from the air-ride system would burst the assist bags. There is a kit that utilizes a lighter compressor but requires installation of a gauge and switch to monitor and control the system. I may investigate the air-assist again in the future, but for now being rid of the air springs was top priority.
Although I left all remaining air suspension components in place, some instructions I found online:
http://www.suncoreindustries.com/instructions/99G-30-R.pdf
http://www.arnottindustries.com/file.asp?Manual=TRUE&ProductID=480&Size=SMALL
I did not do any towing or offroading after the install, but there wasn't any substantial difference in the ride to make me ever want to go back to air springs.