Dual purpose leafs are designed to provide a softer ride than the OEM's without the bump stops installed. When the truck is loaded up, and the bump stops are installed, the Dual Purpose Leafs will not sag like the stock leafs, they will reduce sway and will carry a load better. The center pin has been moved back 1/2" to clear 37" tires. Dual Purpose Leafs are inteded for use up to the GVWR that is set forth by Chrysler.
Dual Purpose Leafs use 64 feet of material and weigh in at 228 pounds for the pair. Be sure to have cookies ready for the UPS man when he delivers this package.
Here’s how they work:
The Dual Purpose leafs are separated into two distinct parts; Primaries and Secondaries. The Primaries are the first 6 leafs that have the eyelets on them. These guys have a spring rate that is very light and pliable. Any small force will move them and allow them to react. This makes them great for daily driving when you want a small event/bump to vanish into the suspension rather than being transferred into the chassis, through the seats, and into your back side. The Primaries allow for
flex, and enormous amounts of deflection. The OEMs can’t do this because they’re made with thick material to carry a load.
Add the secondaries; These guys are along for the ride. They are the 5 leafs that are arched “backwards”. They don’t engage with out the bumpstops installed. With the bumpstops installed they will engage with the Primaries to dramatically increase the spring rate. When both Primaries and Secondaries are engaged, your truck will have a slightly higher spring rate than the OEM units. Removable bumstops are key. By separating the Primaries and Secondaries with the removal of the bumpstops, and also having the ability to combine the two sets of leafs (by installing the bumpstop) your truck will have dual personalities. The bumpstops are easily removed with your truck's ignition key, NO TOOL required. Adjustable Spring rates are the ticket to the “best of both worlds.” A soft ride, WITH a 3/4 ton weight rating. Thus, the “Dual Purpose Leafs” name. (Coined by Bruce, one of our 1st customers.)
Note 1: The Dual Purpose Leafs are designed around a “stock” unlaided truck that hasn’t been heavily modified in the rear. If you carry 750# of weight in the bed all of the time, these leafs may not be what you're looking for. We took 6 months of testing, reconfiguring, and re-testing, with multiple leaf configurations to land on this spring rate, leaf make-up and ride height. It would take another round of testing to redesign the Dual Purpose Leafs and configure them for a custom application. It can be done with an extra charge, but our Dual Purpose Leafs are designed around 95% of the clientele we sell to. Please email us with your custom configuration.
Note 2:
Our Leaf options are designed to give a close to level look when unlaiden. If you load up a level truck, the rear end will squat according to the load. To regain a level look when unlaiden we recommend supplementing our systems with
Firestone Air Bags (downloadable pdf).
