up for SUV use. The frame rails are hydroformed and fully boxed for their entire length. The wheelbase grew to 113 inches (six inches longer than the first generation); for the first time, an extended-wheelbase version was introduced with a 129-inch wheelbase length (1 inch shorter than the GMC Yukon XL). The front suspension used a double-wishbone independent configuration with Bilstein shock absorbers. The rear suspension featured a 5-link solid rear axle; load-leveling air suspension was an option for the rear axle. The second-generation Envoy adopted four-wheel disc brakes as standard equipment. Powertrain For its 2002 debut, the GMT360 Envoy received an all-new standard engine, with a Vortec 4200 4.2L inline-6 replacing the previous 4.3L V6. The first inline-6 from GM in North America since 1984, the "Atlas" engine produced 270 hp (80 more than its V6 predecessor). Beginning in 2003, the Envoy XL could be equipped with an optional 290 hp 5.3L V8. For 2005, the 5.3L V8 was updated to include the Displacement on Demand variable-displacement system (using 4 of 8 cylinders during low-load situations), increasing output to 300 hp. Alongside a standard rear-wheel drive layout, the GMT360 Envoy was offered with either permanent 2-wheel drive or a 4x4 "Shift On-Demand" system, offering 2-wheel drive, Automatic 4-wheel drive, and High-range and Low-range 4-wheel drive (the latter, in 2.69:1 reduction). Two rear axles were offered, a rear "Posi-Trac" limited-slip differential and an Eaton automatic rear locking differential. Trim Throughout its production run, the Envoy was available in three different trim levels: The base SLE trim level was produced from 2002 to 2009, and included a plentiful amount of standard equipment, including full power equipment (power front seats, power door locks, power windows, and power mirrors), keyless entry, cloth seating surfaces, an A/M-F/M stereo with single-disc CD player (later, with satellite radio), a four-speaker audio system, OnStar, aluminum-alloy wheels, a full-size spare tire with black-painted steel spare wheel, a 65/35 split-folding rear bench seat, faux carbon fiber interior trim panels, a cruise control, a dual-zone, manual climate control system, the 4.2L Vortec Inline Six-Cylinder (I6) gasoline engine, and a four-speed automatic transmission. Optional features included an in-dash, six-disc CD changer, a Bose six-speaker premium amplified audio system, a rear DVD entertainment system by Panasonic, a security system, polished aluminum-alloy wheels, a leather-wrapped steering wheel, luxury leather-trimmed seating surfaces, dual heated front bucket seats, and a power moonroof. The uplevel SLT