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The two-wheel-drive off-road market is growing rapidly. Chevrolet responds by offering its Off-Road Performance Z71 package in both two-wheel-drive and four-wheel-drive configurations. As demonstrated in the Silverado Z71 Extended Cab 4x2 that is shown at the 2003 SEMA event, Chevy’s Z71 4x2 Off-Road package can deliver a great deal of performance – on and off the road.

Any discussions of Silverado Z71 Extended Cab 4x2 must begin with the powertrain. Under the hood is the 6.0-liter LQ9 V-8 engine found on Silverado SS production models. However, thanks to cylinder head and camshaft modifications and a GM air box that has been modified for increased airflow and a K&N Filtercharger rechargeable cloth air filter, the LQ9 housed in this special Silverado produces over 400 horsepower at 6100 rpm and over 405 lb.-ft. of torque at 4600 rpm.

Power is transferred to the rear wheels via GM’s Hydra-Matic 4L65-E Heavy Duty four-speed automatic transmission, while spent gases are exhausted via a Corsa Performance cat-back stainless steel exhaust system with polished dual 4-inch outlet tips.

Silverado Z71 Extended Cab 4x2 also features a limited-slip, posi-traction, 4.10:1 differential to enhance off-road capability and a four-wheel-disc, four-wheel anti-lock braking system for improved braking performance, especially in low-traction situations.

Off-road performance on this vehicle begins with a suspension system that has been raised 3 inches from the production model for optimal increased ground clearance. This was accomplished via the use of front and rear springs and the larger, 20-inch wheels and tires combination. Helping to protect vital underbody components during off-road situations are skid plates for the front suspension, engine oil pan, transmission oil pan and the fuel tank.

Outside, Silverado Z71 Extended Cab 4x2 features tubular aluminum side assist steps, tubular aluminum front “bull guard” and three-dimensional expanded-metal front grille screens. The exterior is finished in BASF Thunderstone Metallic and features PPG Midnight Silver accent color on the mirrors, cowl panel, front valance, rear bumper step pad, side assist steps and the front bull guard.

Once inside the vehicle, driver and passengers are treated to front bucket seats and a rear bench seat that are trimmed in preferred light neutral suede side bolsters, lentil suede inserts and olive piping. The door trim panels are also finished in lentil suede and lentil is used on the instrument panel. The instrument panel bezels and switch bezels are finished in Midnight Silver, while the interior trim panels feature a light neutral shade. For easy cleanup, Silverado Z71 Extended Cab 4x2 also features black rubber floor covering.
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