The Sonoma is an attractive truck with a smooth, aerodynamic hood that wraps around the front end. Its clean exterior lines include a body-colored front bumper, fascia and grille, as well as a headlamp design that integrates all forward lighting functions into a single unit. The composite headlamps are standard, with fog lamps available as an option. The front license plate bracket is molded into the charcoal-colored lower valance, while a center-step cutout in the rear bumper gives easy access to the cargo area. The stiff, box-section ladder frame dips in the center to make it easier to step up into the seats, without sacrificing ground clearance for off-highway use.The clamshell-style third-door is a popular option for extended cab models. This driver's-side panel swings out to make it easier to load personal gear, pets and an occasional passenger. Maximum towing capacity on the 2000 lineup has been increased by 400 pounds and is now up to 6,400 pounds (when equipped with a 4.3-liter V6 engine, automatic transmission, 3.42 or 3.73 axle ratio and aftermarket weight-distributing hitch). The standard step bumper is capable of handling trailers of up to 3,500 pounds. Two final drive ratios are available, one for standard duty and a shorter ratio for heavy hauling. Four-wheel-drive models come standard with InstaTrac, a shift-on-the-fly system that allows the driver to shift between two- and four-wheel drive by pressing a button. An optional locking rear differential improves traction in extremely slippery conditions.
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