Leaf Spring Shackle Angle

Ff the springs you are installing are 25 1 4 inches you would need to place the hangers between 24 3 4 and 25 inches apart.

Leaf spring shackle angle.

To determine the effective angle of a shackle pull a string from the center of the front eye to the center of the rear eye of the spring and then a line from the rear eye through the shackle pivot point. Keep in mind that the shackle angle changes and consequently the spring s effective rate changes whenever the suspension moves. Also the shackle s angle will change whenever you change the chassis ride height the arch of the leaf the load on the leaf or the length of the shackle. They also support the vehicle s weight since these are a primary component of the suspension system.

As a leaf spring flexes up or down its length from main eye to shackle eye changes. In this position the shackle has no effect on spring rate. I used an angle ruler which i think is fairly accurate within a few degrees. It allows for the leaf spring to work through length changes during suspension articulation.

The streetside shackle pair is measured at 80 degrees. I was eyeballing the shackle pairs on my frame before they were to come off and it appears that they are at different angles. The shackle should be angled as the drawing shows in the attached helpful article which should be toward the rear of the trailer. Since the shackle direction changes when the leaf is deflected past a flat.

How do you know the correct shackle angle. Measure the angle derived from the two lines. A shackle is an integral component of the suspension system that attaches between the leaf spring and the vehicle frame. A good starting point for shackle angle is 90 degrees.

You can decrease the spring rate by increasing the angle or increase the rate by decreasing the angle. Make sure the trailer is not under load when you are installing the hangers and. The difference is 10 degrees more or less and you can visually see the difference in the angles. 5in spring with 2 5 over shackles gives about 6 5in of lift on a normal truck on the 2nd gen 4runner its about 4in of lift due to the weight of the top on those.

Click below to share your leaf spring knowledge and experience on the forum. The angle can be increased or decreased slightly to change spring rate. This can be achieved by drawing an imaginary line through the middle of both spring eyes and making a 90 degree angle. The leaf packs or leaf springs position and center the axle under the vehicle.

Bumper and everything else on the back can lower it even more. The curbside shackle is at 70 degrees measured from the weld plate on the underside of the c channel.