This Eibach PRO-LIFT-KIT spring set is built on championship winning off-road race technology, and the manufacturer positions it as a way to add ride height without compromising factory components or ride quality. Owners on user forums say that a spring-based lift keeps more factory ride quality than perch-collar or spacer lifts, though the springs feel firmer. The part is for 2021-2026 Bronco trucks with HOSS suspension, and the manufacturer notes it is for use with HOSS 2.0 (Bilstein PSD) and HOSS 3.0 (Fox) dampers only. The product title describes front springs only, but the manufacturer's catalog lists this exact number as a rear pair, so confirm the position with Eibach before ordering a front-only or rear-only lift.
Lift on a HOSS Bronco depends heavily on load. Owners on user forums report that a front-only install on a HOSS 3.0 Wildtrack carrying winch weight gained about 1.8 inches up front, yet the nose still sat roughly an inch below the rear afterward. Searches for Bronco HOSS 3.0 Fox lift springs, 2.7L EcoBoost non-Sasquatch rear lift springs, and HOSS 2.0 Bilstein PSD lift springs usually lead to this same fitment question, so verify the position and damper match against your VIN build sheet before buying.
The manufacturer's catalog lists E30-35-056-01-02 as a set of two rear springs at +1.0 in. The front pair for the same application is listed as E30-35-056-01-20 at +1.8 in. Because product titles describe this number as front-only, confirm the position with Eibach before ordering.
The manufacturer states that the springs are for use with HOSS 2.0 (Bilstein PSD) and HOSS 3.0 (Fox) dampers only. They are not listed for other shock setups.
Owners on user forums report mixed results. One HOSS 3.0 Wildtrack owner with winch weight gained about 1.8 inches at the front but still sat about an inch lower in front than in the rear. Another owner advised running springs at both ends so the geometry stays closer to the design.
Eibach's PRO-LIFT HOSS install sheet (D4020) says only qualified mechanics experienced with suspension removal and installation should do this job, and it recommends a hoist and screw jack to save time. Support the vehicle on jack stands with the wheels blocked, and never use an impact wrench on shock piston rod nuts or shafts. On MacPherson struts, mark the upper perch's orientation relative to the lower perch before disassembly, since that orientation must be kept. Reuse the original stock isolators, dampers, and bump stops, and install each spring with the Eibach logo facing up. Afterward, check wheel alignment, fender clearance with aftermarket wheels and tires, brake line routing, and ABS sensor clearance.
