BEL3900 / 3900 - Application Notes Belltech's New 4-Wheel Drive Lowering Kits are designed to give that custom lowered look and ease of access to your 4x4. The front kit includes a "unique" torsion bar locator that allows you to adjust the drop from 1 to 3 inches. The rear kit includes Belltech's innovative hanger and shackle kit for the proven drop you desire.