Review on 🔧 Optimize your GM G30/G3500 Front Suspension with Timbren GMFK15A Enhancement System (03-09) by Michael Hicks

Very good product, the truck went up where I wanted it to go up 2.5 inches or more. The chassis has become noticeably stiffer, but the handling of the truck has improved significantly, body roll has become much less. I think aligning the buttons with the road will lift the truck off those shocks and give it some travel which will bring back a somewhat normal ride comfort. So far so good, we'll update when I get the keys to upgrade.