These heavy-duty lowering shackles are for the rear of 1999-2026 Ford F-250/350/450 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 due to the longer shackle allowing the leaf spring to flex a little more easily. There are 3-hole locations for the leaf which will allow the user to adjust the drop amount.  When used with OEM leaf springs, the hole locations will give you 1/4", 7/8" or 1.25" 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.  As always these are proudly manufactured in house here in the wonderful USA!