Hi there Sierra owners. Today on your 2015 GMC Sierra 3500, we're going to be installing Firestone's Ride Rite red label extreme duty air helper springs for the rear axle.It's a double convoluted design, which has a high burst pressure than your traditional design. The airbags sit between the frame and your axle to help provide load leveling support. What's nice about airbags, it sets them apart… see more >