PMF Superduty Spring RSK (1992-1997 F250/350)

Superduty Spring Reverse Shackle Kit (1992-1997)

To develop this kit, PMF Suspension collected data and feedback from customers who previously installed this kit. This was the first kit on the market to offer a complete bolt on RSK (reverse shackle kit) to use the Superduty springs on the 1992-97 OBS (old body style) 4x4 trucks that requires no frame or bumper modifications.

With this kit, you can bolt on the conversion hangers using existing holes in your frame and clear all factory bumper mounts and components. For customers that are wanting to install an intercooler, PMF has designed the kit with optional bolt locations to allow additional clearance for most intercoolers end tanks. For this installation configuration, you will need to drill two additional 1/2" holes per side.

The installation of this RSK kit will provide a noticeable improvement in ride quality. This is accomplished through the use of a longer Superduty spring and the relocation of the shackle to the rear of the spring. With that change, the truck is no longer fighting against itself when it hits bumps on the road. Instead, you will have a truck the drives and handles like a 1999-2004 F-250/350.

The kit is available in 3 different lift heights. This is the lift amount of the kit itself. Please keep in mind that depending on what code of Superduty springs are used, you may have additional lift amount. The kit comes complete with the front hangers and rear shackles and all needed assembly hardware. Superduty springs and spring eyelet bolts are not included.

The kit comes standard with a Heavy Duty 1/4" wall square crossbar. This ties the two front hangers together and adds rigidity to the frame itself.

A note from PMF:

"If you are using a 1999-2004 Superduty axle, you must choose the SD Axle configuration so that the mounting configuration is correct!

THIS KIT IS DESIGNED TO WORK WITH A 4x4 BOXED FRAME RAIL.  IF YOU HAVE AN OPEN FRAME RAIL, YOU WILL NEED TO PURCHASE OUR "FRONT FRAME RAIL BOX KIT" SOLD SEPARATELY

THESE WILL REUSE THE OEM LEAF HANGER UNDER THE BODY MOUNT THAT COME ON THE 4X4 CHASSIS.  IF THE TRUCK IS A 2WD, YOU WILL NEED TO SOURCE THE SHACKLE PIVOT BRACKETS OR PUCHASE OUR ADJUSTABLE REPLACEMENTS IN ADDITION TO THIS KIT.  

THESE KITS ARE BUILT TO ORDER.  TYPICAL LEAD TIME ON A BARE STEEL FINISH IS 3ISH WEEKS OR 4ISH WEEKS FOR A POWDER COATED FINISH.  

YOU MUST USE OEM 1999-2004 SUPERDUTY LEAF SPRINGS OR SPRINGS THAT ARE BUILT TO THE EXACT SPRING EYELET TO EYELET LENGTH OF AN OEM LEAF SPRING WHICH IS 55 3/8"!!  SOME AFTERMARKET LEAF SPRINGS ARE MADE TO SHORTER MEASUREMENTS WHICH WILL CAUSE ISSUES WITH AXLE PLACEMENT AND SHACKLE GEOMETRY.  PRO COMP LEAF SPRINGS ARE PARTICULARLY PRONE TO THIS ISSUE!"