Leaf spring U bolts torque spec

The reason they are only 45 is to allow the springs to slip in the spring plates as the suspension compresses and rebounds. Many argue the point saying that the center pin does not allow the leaves to slip. You have to think in terms of how the spring is made. There is a front segment and a rear segment. The entire spring does not flex together. The front segment flexes differently from the rear. Not only because they are different lengths, but also because they are twisting opposite directions of each other. Prove it to yourself. Hold two yardsticks together on one end very tightly with one hand. You cannot bend the yardsticks without the ends in your hand slipping. The center pin makes no difference whatsoever. If the spring plates are over torqued, the springs cannot work correctly. Period.