Firestone Coil-Rite Airbag Helper Springs in Trailblazer EXT


May 23, 2014
We're getting ready for a big trip and I decided to give the 4108 Firestone Coil-Rite Airbag Helper Springs a try in the Chevy Trailblazer EXT from, . Customer service was great and shipping was fast. I ordered Sunday night and received them Wednesday. They looked and felt of good quality, including the optional union tee. I was missing a heat shield but I really only needed one so I didn't worry about it. Installation took quite a bit of wrestling to get them into the springs but I got them in there. I watched several youtube videos before hand in preparation including the Airlift videos. The Airlift's looked like they were more pliable, and were folded into a "hot dog bun" shape before inserting them into the spring. There was no bending these into a hot dog bun. If I had to do it again I would try removing the shocks. I even tried to "lube" the second air bag and spring using Windex but it actually made it much more difficult. I would be curious to try talcum powder. Updates to come after road tests with camper in tow.


  • Box.JPG
    594 KB · Views: 5
  • Jacked.JPG
    986.6 KB · Views: 5
  • Right.JPG
    608.2 KB · Views: 8
  • Valve.JPG
    575 KB · Views: 7


Active Member
Sep 23, 2015
Ooh, you are lucky! I just installed the AirLift bags in my 2007 Jeep Commander. It required complete removal of the springs. The air fitting for the bags goes through the base of the spring perch, and requires drilling a 3/4" hole in the spring perch!

The airlift bags may be more flexible than what you have, but the fittings that came with your kit are better.

I'll start a thread when i can test mine. So far they are holding air.


Active Member
Aug 29, 2010
Yes, those are good fittings. The same type as used on semi truck air systems. For what it's worth, I had to replace a set of air bags inside the front coil springs of a late 70s motor home. I used a vacuum pump that is used for airconditioner work to deflate the bags. It really shrunk them down.