TJM XGS greaseable shackle rear to suit Nissan Navara D21 / D22 vehicles. Shackles are an integral component of the suspension system that attaches between the leaf spring and vehicle frame. As a leaf spring flexes up or down, its length from main eye to shackle eye changes. Since one end is mounted solidly (the main eye), and cannot move, length changes occur at the shackle end of the leaf pack. TJM greaseable shackles allows regular greasing to lubricate the bushes with no dismantling required for access.