Replaced airbags with these springs on my '06 and '07 SS Triblazers. Very little effort or mechanical knowledge is required. Jack up the truck, support the axle, loosen the shock absorbers, lower the axle, unscrew the springs, insert the springs, raise the axle, connect the shock absorbers, put the truck on the ground. These springs seem a bit stiffer than the bags but definitely not hard and stiff. They take away the sloppy cornering that bags have provided. The move away from the big fishtail