Jeep Front Truss Lower Control Arm High Clearance Large Tube Mounts Jeep XJ/TJ/LJ/ZJ TNT Customs. Jeep high clearance lower control arm mounts are just what is needed to get those control arms up out of the rocks. These mounts are welded to the axle after you have the truss in place on the axle. Because these mounts are welded on the back side of the axle instead of below the axle, you must have adjustable control arms to use these mounts.Mounts are for large tube axles, small tube available. CNC cut and precision formed out of 3/16th steel.