Kevlar 4-1/2" HD Rear Super Shackles with Greasable Rear Spring Bushing Kit, 43mm Spring Eyes

After seeing some thrashed rear shackles, we decided a beefier system was in order.  These are folded and fully welded 1/4" steel with a .250 wall tube.  The back gusset is extended down the spring mounting "ears" to keep them from bending.  We also build them in different lengths for custom suspension applications. 

The "short" length is 4.5" center to center which is the same as a '88-'98 GM and 1/2" longer than a '67-'87 GM trucks.

These shackle works on any GM or other vehicle with 2.5" wide springs and spring hangers in either tension or compression shackle applications.

Install these HD rear shackles with the open side to the front to prevent contact with the main leaf of the spring.

With deeper arch springs (6" or more lift) use the longer shackles and a shorter shackle flip.  An example would be a 12" total lift would use the 2.5" shackle flip, a 6" HD rear shackle and the 8" lift spring.  The longer shackle length helps keep the shackle from inverting to the front or back.  There's nothing wrong with the 2.5" flip / 6" HD shackle combo for shorter lifts either but it's essential for taller springs.

Using stock length shackles with deep arch springs and a shackle flip can allow the shackles to flip the wrong direction, the fix is our longer 6" shackles.  The longer shackles keep the shackle from flipping forward and allow the spring to compress and stretch out naturally under the weight of the truck.

We've implemented new Kevlar infused polyurethane bushings into our entire lineup, any of our products with suspension bushings in them will now have the best bushings available!

Infusing Kevlar into polyurethane doubles the tensile strength, tear resistance, and increases the life of the part by cross linking the polyurethane. We elected to keep the same durometer (stiffness) so as not to inhibit suspension travel, as well as keeping the black color everyone is used to. Basically with double the tensile strength, the bushing can be pushed harder and still come back to it's original shape. All of that means using your truck more and maintaining it less, and reduces the cost of replacing bushings!

Due to its wide range of elastomeric properties and strength factors, Kevlar Infused polyurethane out handles, out preforms, and outlasts other similar polyurethane materials on the market.

We also added chamfers to make bushing install easier!