OEM Standard FRUEHAUF SMB Air Spring 4159NP03 Contitech 1DK21B-2 Phoenix KR 509-25

OEM Standard FRUEHAUF SMB Air Spring 4159NP03 Contitech 1DK21B-2 Phoenix KR 509-25 Air Shock Absorber Air Suspension

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1. Factory air ride? You bet! An optional rear air suspension system was introduced on the ’14 Ram heavy-duty trucks. On the 2500, an airbag replaced the coil spring, much like the Ram 1500. Load capacity is not sacrificed and, in fact, ride and handling get even better. The air suspension is also capable of load-leveling, where payload or the load on the rear suspension from a trailer is automatically detected and accounted for. The 3500, while still featuring the rear Hotchkiss leaf spring system, received a supplemental air suspension system on single and dual-rear-wheel applications. With the addition of air bags, the leaf springs were softened, allowing for more unladen suspension movement.

2.a different approach to the air spring assist game with its Two-Stage kits that replace the rear shackle hanger assembly. In its place, a new assembly that houses an air spring makes the connection to the leaf spring shackle. This design allows for the initial harshness of bumps to be absorbed by the bags before being transferred to the leaf springs. The result is a very smooth ride when unloaded and a fully capable regular heavy-duty vehicle when fully loaded. This allows for easier daily use of a normally unbearable large truck’s rear suspension. Kelderman also offers link-type systems that completely replace the stock suspension components for an even smoother ride.   

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