HD replacement spring for 35166.9004, meant for 500lbs additional weight on rear axle. If ran with out the proper amount of weight, too much lift will cause poor ride quality.
Front Adjustable Threaded Spring Perch to Accommodate Increased Loads and Maximum Clearance. ERO Off-Road Race Spring Equipped and Compatible.This Part Fits:YearMakeModelSubmodel2021-2024FordBronco
Eibach 21-23 Ford F150 Raptor Pro-Lift-Kit HD Rear Springs (Designed to Use OE Fox Electronic Shock)This Part Fits:YearMakeModelSubmodel2021-2023FordF-150Raptor2023<