Once sure the framerails are still level (and the angle gauge reads 0.0) the angle gauge is then relocated from the framerail top to the top surface of the new crossmember. With the crossmember steps snug to the bottoms of the framerails (and the angle gauge still showing 0.0) the rear edge of the crossmember is then lowered until the angle gauge reads a 1.5-degree angle toward the rear of the chassis. (The forward edge of the crossmember member should be firmly in contact with the frame and only the rear edge lowered to achieve the 1.5-degree reading.) The crossmember is then held in that position (shims may be necessary). Next, the centerline of the crossmember and the axle centerline are checked again to ensure they were still lined up and the distance from the lower control arm holes to the opposite frame side are measured to ensure they’re of equal distance on each side. The crossmember is then securely tack welded to the frame and the measurements and alignments checked yet again. Once satisfied, the assembly can then be finish-welded, moving from side to side to prevent overheating the frame.