I have a 2007 Silverado 1500 (new body style) Ext cab LT2 with rear drum brakes. Is there ABS sensors on the rear? According to the VIN it shows there is but there'* nothing but the brake lines are parking cables going to each side. When I look up the part number the exploded view shows disc setup.

Is there a sensor on the axle/diff?

I think these reuse the VSS on the output shaft of the transmission for rear lockup telemetry.