2013 Chevrolet Silverado 3500HD

4WD Ext Cab 158.2" SERVICE Truck 4WD Ext Cab 158.2" SERVICE Truck Rear axle, 3.73 ratio ( Suspension Package, Handling/Trailering, heavy-duty includes 35mm monotube shocks and 34mm front stabilizer bar Air cleaner, high-capacity Transfer case, with floor-mounted shifter (Requires 4WD models) Cooling, external engine oil cooler, heavy-duty air-to-oil integral to driver side of radiator tank Cooling, auxiliary external transmission oil cooler, heavy-duty air-to-oil Battery, heavy-duty 600 cold-cranking amps, maintenance-free with rundown protection and retained accessory power Alternator, 125 amps Frame, fully boxed, hydroformed front section Suspension, front independent, torsion bar Suspension, rear 4+1+2 multi-leaf springs for single rear wheel and 3+1+2 multi-leaf springs for dual rear wheel Exhaust, aluminized stainless-steel muffler and tailpipe --- --- --- INTERIOR Floor covering, Black rubberized vinyl Steering wheel includes theft-deterrent locking feature Instrumentation, analog with speedometer, fuel level, engine temperature, tachometer, voltmeter and oil pressure indicators Driver Information Center with odometer, trip odometer and message center --- Differential:Differential, heavy-duty automatic locking rear Trailering:Trailering equipment, heavy-duty includes trailering hitch platform and 2.5- inch receiver with 2" adapter, 7-wire harness (harness includes wires for: park lamps, backup lamps, right turn, left turn, electric brake lead, battery and ground) with independent fused trailering circuits mated to a 7-way sealed connector, wiring harness for after-market trailer brake controller (located in the instrument panel harness) and (JL1) integrated trailer brake controller