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The 2008 GMC Yukon XL comes in three trim levels and two carrying capacities. The Yukon XL SLE 2WD ($38,185) and 4WD ($40,985) and the better-equipped SLT 2WD ($39,020) and 4WD ($41,810) offer a choice of V8 engines, including two versions of the Vortec 5.3-liter V8 that can run on E85 ethanol. The aluminum-block 5.3 makes 310 horsepower and 335 pound-feet of torque in 4WD models and 320 horsepower and 340 pound-feet of torque in 2WD models. A more powerful engine is optional for these 1500-series models, an all-aluminum 6.0-liter V8 with variable valve timing, making 366 horsepower and 380 pound-feet of torque ($1,095). The Yukon XL's available four-wheel drive is a full-time system that can be driven on dry pavement and has low-range gearing. Yukon XL 1500 models use a four-speed automatic transmission.The 2500-series models have truck tires and a heavier suspension using leaf springs. The SLE 2WD 2500 ($39,585), SLE 4WD 2500 ($42,385) and the SLT 2WD 2500 ($40,380) and 4WD SLT 2500 ($43,180) come with a 352-hp version of the 6.0-liter V8 that makes 383 pound-feet of torque. Also, 2500 models get a six-speed automatic for 2008. Also offered are the luxurious 2WD Denali ($48,130) and AWD Denali ($51,175). The Denali's all-wheel-drive system lacks low-range gearing. The Denali models come with a 6.2-liter V8 that produces 380 horsepower and 417 pound-feet of torque along with a six-speed automatic transmission with manual mode and GMC's AutoRide active electronic suspension. They all have a Tow/Haul mode, which reduces upshifting and downshifting, and also shifts quicker, so the transmission doesn't work so hard when pulling a big load. Transmission oil temperature is part of the instrumentation (along with a tire-pressure monitor). The SLE standard equipment includes cruise control; three-zone manual climate control; AM/FM/CD/MP3, eight-speaker stereo with XM satellite radio; OnStar assistance with one year subscription; driver information center; the usual powered features, with the outside mirrors heated and foldable; a six-way power driver's seat; leather-wrapped, tilt steering wheel with audio controls; cloth upholstery; auto-dimming rearview mirror; 40/20/40 split front bench seat; six-way power driver's seat; 60/40 split folding second-row bench seat; two-passenger third-row split folding seat; automatic headlights; roof rails; side steps; locking rear differential; three power outlets; and P265/70R17 all-season tires on bright aluminum wheels. Also standard is a tow package with a heavy hitch, seven-pin wiring harness, two-inch receiver and electric brake control harness. A 3SB package for SLE ($835) adds front bucket seats, a power front passenger seat, a front center console, rear radio and climate controls, and fog lights. A Convenience Package ($560) has rear park assist, power-adjustable pedals and remote engine starting. SLT models get tri-zone automatic climate control with rear controls, front tow hooks, leather upholstery, front bucket seats with six-way power adjustment, front center console, six-disc CD changer, rear seat audio controls and outputs, universal garage door opener, fog lights, remote engine starting, power adjustable pedals, rear park assist, and polished alloy wheels. A 4SB option package for SLT ($3,705) adds heated, 12-way adjustable front seats with lumbar adjustment; memory for the driver's seat and mirrors; Bose nine-speaker audio system with subwoofer; roof rack; and power-folding exterior mirrors with integrated turn signals, driver's side auto-dimming, and reverse tilting. Denali models come fully loaded, with a wood and leather-wrapped steering wheel; second-row bucket seats; heated first- and second-row seats; 12-way adjustable front seats with lumbar adjustment; memory for the driver's seat and mirrors; power-folding second-row seats; removable three-passenger split-folding third-row seat; power-folding exterior mirrors with int
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