2. We like simple, and the Ready Lift SST (PN: 69-3285, $939.95) suspension system was just that. At the heart of the system was a steel strut spacer and DOM tubular upper control arm. The heavy-duty control arm featured OEM-style ball joints pre-pressed into a crown that retained OEM geometry throughout the suspension cycle and provided additional clearance for increased suspension travel. To lift the rear of the Silverado, this SST system included 3-inch OEM-style cast-iron rear lift blocks and U-bolts with shock extenders to retain the great factory ride. The U-bolt nuts did not make the picture, but this is all you need to add four inches of front and 1-3/4 inches of rear lift to your '07-'12 Silverado or Sierra two-wheel-drive.