These heavy duty lowering shackles are for the rear of 1999-2019 Ford F-250/350 trucks, both 2wd and 4wd models. Unlike most other lowering shackles on the market, we manufacture these from 1/4" laser cut steel and DOM tubing. These use a Polyurethane bushing with a grease zerk and a heavy duty zinc plated inner sleeve. With the installation of these, the user will notice a slightly softer ride do to the longer shackle allowing the leaf spring to flex a little more easily. There are 3 hole locations that will determine drop amount and some adjust-ability. When used with OEM leaf springs, the hole locations will give you no drop, 3/4" or 1.5" of drop. Aftermarket leaf springs may respond differently. These bolt in using OEM hardware. Payload is not affected. These come standard in a powder coated finish. Bare is available upon request. As always these are proudly manufactured in house here in the wonderful USA!