Rear axle, 3.73 ratio
Air cleaner, high-capacity
Trailer brake controller, integrated
Four wheel drive
Suspension, rear 4+1 multi-leaf springs
Engine, Vortec 6.0L Variable Valve Timing V8 SFI (360 hp [268.4 kW] @ 5400 rpm, 380 lb-ft of torque [513.0 N-m] @ 4200 rpm) with (E63) fleetside pickup box; (322 hp [240.1 kW] @ 4400 rpm, 380 lb-ft of torque [513.0 N-m] @ 4200 rpm) with (ZW9) pickup box delete
Steering, power, recirculating ball
Exhaust aluminized stainless-steel muffler and tailpipe
Frame, hydroformed front section
Differential, heavy-duty automatic locking rear
Cooling, auxiliary external transmission oil cooler heavy-duty air-to-oil
Alternator, 125 amps
Transfer case, electronic shift with rotary dial controls (Requires 4WD models)
Suspension, front independent, torsion bar with increased front GAWR
Suspension Package, Handling/Trailering, heavy-duty includes 35mm twin tube shock absorbers and 36 front stabilizer bar
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 (Will be deleted if (ZW9) pickup box delete is ordered.)
Cooling, external engine oil cooler heavy-duty air-to-oil, integral to driver side of radiator tank
Battery, heavy-duty 600 cold-cranking amps, maintenance-free with rundown protection and retained accessory power
Brakes, 4-wheel antilock, 4-wheel disc
Recovery hooks, front, frame-mounted