A traction bar prevents rotation of an axle housing for a vehicle utilizing leaf springs. A traction bar has a rigid rail member having a first end and a second end. The traction bar also has a pivoting shackle member having a proximal end and a distal end. The proximal end of the shackle member is pivotally attached to the vehicle frame or to a vehicle frame bracket attached to the vehicle's frame. The distal end of the shackle member is pivotally attached to the first end of the rigid rail member. An axle bracket is pivotally attached to the second end of the rigid rail member. The three pivots provided with the traction bar provide for normal movement of the suspension without binding. However, upon acceleration or high torque load, the shackle member is thrust into axial alignment with the rigid rail member, stopping forward motion of the rigid rail member.