The 5 leaf progressive add a pack rear springs replace the lower overload leaf on the factory leaf spring pack (1″ thick leaf that doesn’t follow the contour of the rest of the pack) with 5 thinner gauge leaf spring designed to maintain the factory load capacity while increasing mobility of the spring. Improved traction and predictability are immediately noticeable and as is a much-improved ride off-road and when loaded.
The 2019 Ram 3500 brought a few changes to the platform. First, the rear axle was upgraded to the AAM 12″ from the 11.5″ in previous generations increasing the axle tube diameter to a whopping 4.25″. Additional, the rear end of the truck was lowered nearly 2″. From the factory, this give a 1″-1.5″ rear high stance. To accommodate this change, we’ve added a 1″ in house machined Billet Aluminum block to our progressive add-a-pack (totaling 2″ – 2.5″ of lift) to ensure a level stance when paired to our 3″ front lift coil springs.