Review on Engine Optimization Spring Assist by Brandon Mcvey

Rated 4 stars due to some difficulty with the mounting brackets. I understand vehicles are different and installation procedures will vary. However, the hardware package was useless aside from the spring bases that the rings rest on. I removed my lower bumpers and bent the suspension until it snapped under the frame and welded the bases over my axle. The weight of the vehicle (08 Colorado Z71) and the location of the springs make them almost impossible to loosen. However, I will say after all the hassle of installing them. it's totally worth it. The rear end is now much stiffer and can handle heavy loads without sagging. Overall it's worth it, but be prepared to make some changes to ensure a permanent install.