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Carli aimed to design a leaf spring pack that would provide a more supple and planted ride with only a slight reduction from a standard 3/4-ton load capacity. Rather than built to haul, they’re designed with an emphasis on ride quality and consideration for capacity. In the “haul well” to “ride well” spectrum, we center the springs to ensure they’re still capable of hauling a capacity respective to the 3/4 to 1-ton platform (albeit, less than the factory springs), but ride much better.
We do this as there are load supplements available to ensure one can safely max the truck’s capacity when their use-case demands it, even with reduced rate leaf springs. Potentially improving ones hauling situation even relative to factory springs, utilizing a Carli Spring with a compatible load supplement affords users a better unloaded ride with adjustable rear height/load balancing of which a factory spring is not capable.
As with the factory leaf springs, our complete replacement packs are 2-stage, but we implemented far more progression to the spring rate in a high-leaf-count pack design.
Optimizing a high-leaf-count pack requires many considerations… Most of all – efficiency of spring rate engagement. The easiest way to understand this concept is to consider an optimal result as you’d see in a coil spring. If you put 500lbs onto a single coil spring rated for 1,000lbs, you’ll want to see 50% sag. As there’s very little to interfere with the coil’s ability to do its job, the result would likely be very near ideal at 50% sag. Leaf springs, however, will vary based on shackle design, bushing bind, and coefficient of friction – all of which can impede the leaf spring’s efficiency.
Carli utilizes a proven poly bushing and crush sleeve. This 3-piece design allows free movement of the bushing material around the bolted crush sleeve allowing unimpeded axial movement of the spring eyelet and subsequently, a much better ride. Combine the Carli Leaf Springs with the Carli Fabricated Shackle to eliminate ALL vulcanized bushings for the best result. The bushings are a high-durometer (hardness) poly material so one can expect a LONG service life.
The only downside to poly is that it can be noisy if not properly greased. To ensure quiet operation, we include the proper grease and designed our bushings with grease flutes for extra grease capacity and proper grease migration.
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