2008 GMC Sierra

Overview

The 2008 GMC Sierra raises the bar for full-sized pickups. Sierra is offered in both light and heavy duty (HD) models in the following configurations:

  • 1. Regular Cab, Extended Cab, Crew Cab and Chassis Cab (HD only) body styles.
  • 2. Short (light duty only), Standard and Long Box lengths.
  • 3. 2WD and 4WD.
  • 4. Six trims: WT, SL (Crew Cab only), SLE-1, SLE-2 (Extended and Crew Cab only), SLT (Extended and Crew Cab only) and Denali (light duty Crew Cab only.)
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Top Ten Features

  • 1. NHTSA 5-star rating for frontal impact Unlike some competitors in the full-size pickup market, Sierra 1/2-ton models received a 5-star rating for frontal impact from NHTSA in 2007.
  • 2. Industry-leading powertrain warranty GMC Sierra is protected by the best ownership package in the industry with a 5-year/100,000-mile powertrain warranty that also includes roadside assistance and courtesy transportation.
  • 3. Segment-leading fuel economy Not only is the 5.3L V8 the only V8 engine to offer over 300 hp and 20 mpg highway, it is the most fuel efficient V8 engine in the segment! 2008MY fuel economy estimates for the 5.3L V8 are 15 mpg city and 20 mpg highway for 2WD models, and 14 mpg city and 19 mpg highway for 4WD models. In addition to being the most aerodynamic full-size on the market, GMC also employs efficiency technologies such as Active Fuel Management™ to help reduce fuel consumption. Standard on all 5.3L and 6.0L V8 engines.
  • 4. Best-in-class power Sierra Denali’s 403 hp 6.2L V8 is the most powerful 1/2-ton V8 in the class; the 353 hp 6.0L Vortec V8 is the most powerful gas V8 in a heavy duty pickup; the 6.6L Duramax Turbo Diesel provides 365 hp and 660 lb.-ft. of torque— more than any other heavy duty pickup.
  • 5. Best-in-class capabilities In both payload and towing capacity. The 1/2-ton Crew Cab is rated for a maximum payload of 1965 lbs., while 1/2-ton 4X4 Crew and Extended Cab models can tow 10,500 lbs.
  • 6. Light duty fully boxed frame Is designed for immense overall strength and durability, improved isolation from road noise and better ride performance. With 230% more torsional stiffness than previous generation Sierras, a hydroformed front portion with fewer welds for an optimum fit and a rear frame that is fully boxed, this ingenious design boosts payload capacity without adding unnecessary mass.
  • 7. New light duty integrated trailer brake controller Is integrated with the ABS system and provides immediate and measured brakeforce signaling to electriccontrolled trailer brake systems. The response is simultaneous with the application of the vehicle brakes. The controller also facilitates hookup of trailer brakes. Available with StabiliTrak.
  • 8. OnStar Turn-by-Turn Navigation Provides voice-guided directions at the touch of a button. Included with available OnStar Directions & Connections Plan.
  • 9. Best-in-class front seat head room Among all cabs in the segment. At 41.5", Sierra beats F-150, Dodge Ram Quad Cab, Toyota Tundra and Nissan Titan.
  • 10. Automatic locking rear differential Automatically locks the rear wheels together when one wheel loses traction at low speed. This transfers drive torque to the wheel with traction, allowing the vehicle to pull away. Sierra’s auto locker is superior to the limited slip differentials offered by competitors. Available on all models; included with Z71.

Power & Handling

  • (LU3) Vortec 4.3L V6 engine 195 hp @ 4600 rpm and 260 lb.-ft. of torque @ 2800 rpm. Standard on Regular Cab and 2WD Extended Cab Short and Standard Box WT models.
  • (LY2) Vortec 4.8L V8 engine 295 hp @ 5600 rpm and 305 lb.-ft. of torque @ 4800 rpm. Standard on 4WD Extended Cab Short and Standard Box WT models, on Crew Cab WT and SL and on all SLE-1 models except Extended Cab Long Box.
  • Vortec 5.3L V8 engine with Active Fuel Management 315 hp @ 5200 rpm and 338 lb.-ft. of torque @ 4400 rpm. (LY5) Iron Block version is standard on Extended Cab Short and Standard Box SLE-2 and SLT, on all Long Box Extended Cab models, and on 2WD Crew Cab SLE-2 and SLT. Available on Regular Cab models and on 2WD Crew Cab and Extended Cab Short and Standard Box SLE-1 models. (LH6) Aluminum Block version is standard on 4WD Crew Cab SLE-2 and SLT. Available on 4WD Crew Cab WT and SLE-1.
  • Vortec 5.3L V8 FlexFuel engine w/ Active Fuel Management 315 hp @ 5200 rpm and 338 lb.-ft. of torque @ 4400 rpm. Capable of running on any combination of gasoline and E85. (LMG) version is available on Regular, Extended Cab and 2WD Crew Cab WT, SLE-1, SLE-2 and SLT models. (LC9) is available on 4WD Crew Cabs.
  • (L76) VortecMAX 6.0L V8 VVT engine with Active Fuel Management 367 hp @ 5500 rpm and 375 lb.-ft. of torque @ 4300 rpm. Available on Short and Standard Box Extended Cabs and Crew Cab SLE and SLT models.
  • (L92) 6.2L V8 VVT 403 hp @ 5700 rpm and 417 lb.-ft. of torque @ 4300 rpm. Standard on Denali.
  • (LY6) Vortec 6.0L V8 engine 353 hp @ 5400 rpm (312 hp @ 4400 rpm with dual rear wheels) and 373 lb.-ft. of torque @ 4400 rpm. Offers more horsepower than any competitor’s gasoline V8. Standard on HD models.
  • (LMM) Duramax 6.6L Turbo Diesel V8 With tow/haul mode. Standard on 1500 Sierra WT, SL, SLE and SLT.
  • (M30) 4-speed automatic transmission 315 hp @ 5200 rpm and 338 lb.-ft. of torque @ 4400 rpm. Capable of running on any combination of gasoline and E85. (LMG) version is available on Regular, Extended Cab and 2WD Crew Cab WT, SLE-1, SLE-2 and SLT models. (LC9) is available on 4WD Crew Cabs.
  • (M70) 4-speed automatic, super-duty transmission Included with the VortecMAX 6.0L V8 for greater hauling and towing capacities.
  • (MYC) 6-speed heavy duty transmission With tow/haul mode and tap-up/tap-down shifting. Standard on Denali.
  • (MYD) 6-speed Hydra-Matic automatic transmission With wide gear ratio, Driver Shift Control with tap-up/tapdown shifting and tow/haul mode. Standard on all Sierra HD models.
  • (MW7) Allison 1000 6-speed automatic Available with the Duramax engine on all HD models except 3500HD Regular Cab 2WD.
  • High idle option Available on all HD models.
  • Z82 trailering equipment Includes a weight-distributing hitch platform, 7-wire harness, high capacity air cleaner and auxiliary transmission cooler.
  • Light Duty fully boxed frame Is 230% stiffer in torsional strength with Hydroformed front frame rails, longer straighter front rails, L-channel design at cab foot well, hydraulic engine mounts and tuned body mounts and thicker rear section.
  • Independent front suspension Coil-over-shock design on LD models can be tuned for optimum ride height and damping. HD models get a rugged independent torsion bar suspension.
  • Multi-leaf spring rear suspension Balances ride smoothness and hauling capability. 2-stage springs on 1500 and 2500HD; 3-stage on 3500HD.
  • Four available suspension packages.
    • 1. Z83 Solid Smooth Ride. Provides smooth ride and handling for light duty service. Standard on all 1500 WT configurations and SL Crew Cab.
    • 2. Z85 Heavy Duty Handling/Trailering. A more rugged suspension for heavier service. Standard on SLE and SLT models and all HD models; available on 1500 WT and SL.
    • 3. Z71 Off-Road. Includes off-road jounce bumpers and stabilizer bars. Available on all single rear wheel models with SLE or SLT trim; included with (PDL) Z71 Off-Road Package.
    • 4. Z60 High Performance. Includes 36mm front stabilizer bar.Standard on Denali; available on all SLE and SLT models.
  • G80 automatic locking rear differential Automatically locks the rear wheels together when one wheel loses traction at low speed, transferring torque to the wheel with traction. Available on all models.
  • AutoTrac Is integrated with the ABS system and provides immediate and measured brakeforce signaling to electriccontrolled trailer brake systems. The response is simultaneous with the application of the vehicle brakes. The controller also facilitates hookup of trailer brakes. Available with StabiliTrak.
  • StabiliTrak Stability Control System with Proactive Roll Avoidance Monitors and compares driver steering input vs. vehicle response and makes corrections that help the driver maintain control. Standard on 1500 Crew Cabs and Denali; available on Extended Cab Standard Box SLE and SLT.
  • Front disc/rear drum brakes with ABS Standard on 1500. 4-wheel discs with ABS standard on HD models and Denali.
  • Integrated brake controller Available on 1500 Crew Cabs, Extended Cab Standard Box SLE and SLT and all HD models.
  • Wheels A range of 17" wheels are offered on 1500 models with 18" polished aluminum standard on Denali; 20" machined aluminum available on 1500 SLE-2, SLT and Denali. NEW 17" wheels are standard on 3500HD dual rearwheel models. A range of 16" wheels offered as options on HD models.

Comfort And Convenience

  • NEW Classic SLE1/3SA Value Packages (PDX/PDZ) These packages combine the popular LD Power Pack (5.3L V8, locking differential and HD trailering) with the choice of aluminum wheel and a GM Accessory (tubular chrome Assist Steps for Extended Cabs, brushed aluminum Bed Extender for Crew Cabs) to create a package of exceptional value. Carries an Option Package Discount.
  • Sierra Limited Edition (B2E) Includes Light Duty Power Package (Vortec 5.3L V8, automatic locking rear differential and HD trailering), steering wheel controls, high performance suspension, 3.73 axle and 20" OEM chrome wheels.
  • VortecMax Performance Pack Includes the Vortec High Output 6.0L V8 engine, VortecMax engine cover and door badges, locking rear differential, heavy duty trailering equipment and a 9.5" axle. Gives Sierra best-in-class light duty towing.
  • Sierra Performance Edition (B4V) Includes Vortec High Output 6.0L V8, VortecMax engine cover and door badges, HD automatic transmission, high-performance suspension, traction control, HD trailering and HD oil cooler, engine oil cooling system, 3.73 axle, automatic locking rear differential, steering wheel controls and OEM 20" chrome wheels.
  • Light Duty Power Package Includes choice of (LM7) Vortec 5.3L V8, (L33) aluminum Vortec 5.3L V8 or (L59) Vortec 5.3L V8 FlexFuel engines, plus locking differential and trailering equipment. Carries an Option Package Discount.
  • OnStar Plus Package Includes OnStar, XM Satellite Radio and steering wheel-mounted controls. Carries an Option Package Discount.
  • Fog lamps Standard on SLE, SLT and Denali.
  • Power sunroof With express-open and wind deflector. Includes Universal Home Remote. Available on SLE2/3SB, SLT and Denali; may be ordered with the DVD Rear-Seat Entertainment System.
  • Uplevel OSRV mirrors (DL3) Power folding, power adjusting and heated, with driver side electrochromic, curbtilt and turn signal in glass. Standard on SLT (black) and Denali (body color); available on SLE in black or chrome (with Chrome Package). Denali adds standard curb tilt and ground illumination.
  • Full-feature front bucket seats Leather-trimmed, power reclining driver and passenger seats with 10-way power adjustability, power lumbar, separately heated cushions and seatbacks and 2-position driver memory. Includes rear leather on Crew Cabs. Standard on SLT and Denali.
  • Floor console Houses storage compartment, 12-volt power outlets, cupholders and available rear seat audio and climate controls. Standard on all models with bucket seats.
  • Driver Information Center (DIC) Includes trip odometer and message center and monitors numerous vehicle systems such as change oil, transmission temperature and oil change notification. Standard on all models.
    • comparison chart
    • Engine
      Horsepower @ RPM
      Torque @ RPM
    • 5.3L OHV V8 w/ Active Fuel Management 315 @ 5200, 338 @ 4200
    • 4.7L DOHC i-FORCE V8 271 @ 5400, 313 @ 3400
    • 5.4L SOHC Triton V8 300 @ 5000, 365 @ 3750
    • 5.7L HEMI V8, 345 @ 5400, 375 @ 4200
    • 5.6L DOHC Endurance, V8 w/ CVTC, 317 @ 5200, 385 @ 3400
    • Engine (A)
      Horsepower @ RPM
      Torque @ RPM
    • 5.3L OHV FlexFuel w/, Active Fuel Management, 315 @ 5200, 338 @ 4400
    • 5.7L DOHC, i-FORCE V8, 381 @ 5600, 401 @ 3600
    • 5.4L SOHC Triton, V8 FlexFuel, 300 @ 5000, 365 @ 3750
    • -
    • 5.6L DOHC FlexFuel, Endurance V8, 317 @ 4900, 385 @ 3600
    • Engine (A)
      Horsepower @ RPM
      Torque @ RPM
    • 6.0L OHV V8 w/ Active, Fuel Management, 367 @ 5500, 375 @ 4300
    • -
    • -
    • -
    • -
    • Transmission
    • 4-speed auto. w/tow/haul mode
    • 5-speed auto.;6-speed auto. (A)
    • 4-speed auto.
    • 5-speed auto. w/tow /haul mode
    • 5-speed auto. w/ tow/haul mode
    • Max. payload, 2WD (lbs.)
    • 1965 (6.0L V8)
    • 1450
    • 1780
    • 1460
    • 2013
    • Max Towing, FWD/4WD (lbs.)
    • 10,200 (6.0L V8)
    • 8000
    • 9500
    • 8600
    • 9200
    • GVWR, 2WD (lbs.)
    • 7100 (6.0L V8)
    • 6800
    • 7050
    • 6700
    • Not listed
    • Wheelbase/length (in.)
    • 143.5/229.9
    • 145.7/228.7
    • 138.5/223.8
    • 140.5/227.7
    • 139.8/224.6
    • Front suspension
    • Independent coil-over-shock
    • Independent double-wishbone w/ stabilizer bar
    • Independent double-wishbone
    • Independent coil spring w/ stabilizer bar
    • Independent double-wishbone w/ stabilizer bar
    • Rear suspension
    • 2-stage multi-leaf springs w/monotube shocks
    • Live axle w/multi-leaf springs
    • Hotchkiss-type non-independent live axle w/ leaf springs
    • Live axle w/multi-leaf springs
    • Multi-leaf w/ solid axle
    • Rear axle
    • G80 heavy duty locking (A)
    • Automatic limited-slip
    • Limited-slip (A)
    • Limited-slip (A)
    • Limited-slip
    • Vehicle stability control
    • S
    • S
    • -
    • S
    • A
    • Roll avoidance system
    • S
    • -
    • -
    • -
    • -
    • Steering
    • Rack-and-pinion
    • Rack-and-pinion
    • Rack-and-pinion
    • Rack-and-pinion
    • Engine-speed-sensitive rack-and-pinion
    • Brakes
    • Front disc/rear drum w/ ABS; 4-wheel disc w/ ABS (A)
    • 4-wheel disc ABS w/ EBD, BA
    • 4-wheel disc w/ ABS
    • 4-wheel disc w/ ABS, EBD
    • 4-wheel disc w/ ABS, EBD; BA (A)
    • Wheels
    • 17" 6-lug aluminum
    • 18" alloy
    • 18" cast aluminum
    • 17" chrome clad aluminum
    • 20" aluminum
    • Wheels (A)
    • 20" machined aluminum
    • 20" alloy
    • 18" machined cast aluminum; 20" machined aluminum
    • 20" chrome clad aluminum
    • -
    • Max. seating capacity
    • 2/3
    • 3/3
    • 3/3
    • 3/3
    • 3/3
    • Seat adjustment, driver/front passenger
    • 10/10
    • 10/4
    • 6; Multi (A)
    • 6; Multi (A)
    • 8/6
    • 2-position driver memory
    • S
    • S
    • A
    • -
    • S
    • Leather-appointed 1st, 2nd row seats
    • S
    • S
    • S
    • S
    • S
    • Heated front seats
    • S (Cushions & seatbacks)
    • S
    • A
    • A
    • S (Cushions only)
    • 60/40 folding bench rear seat
    • S
    • S
    • S
    • S
    • S
    • Leather-wrapped steering wheel w/ controls
    • S (Audio/cruise)
    • Leather not listed (Audio, cruise)
    • S (Audio,climate, cruise)
    • S (Audio)
    • S (Cruise, audio)
    • Driver Information Center
    • S
    • Multi-information display
    • Message center w/ trip computer
    • Trip computer & maintenance interval indicator
    • Multi-function information center
    • Power-adjustable pedals
    • A
    • -
    • A (w/ memory)
    • S
    • S
    • Automatic climate control
    • S (Dual-zone)
    • S (Dual-zone)
    • S (Single-zone)
    • Manual (Dual-zone)
    • S (Dual-zone)
    • Auto-dimming ISRV mirror
    • S (w/ compass & outside temp. display)
    • S
    • S
    • S
    • S
    • Power, heated OSRV mirrors
    • S (w/ power-fold & driver auto-dimming & turn signals); Camper (A)
    • S (Folding w/auto-dimming, puddle lamps & turn signals); Extendable (A)
    • S (power); Power-fold w/ driver side auto-dimming, puddle lamps & turn signals (A)
    • S (Foldaway) Trailer tow (A)
    • S (Chrome w/ power fold, auto-dimming, heat & puddle lamps); Extendable towing (A)
    • Power sliding rear window
    • A
    • S
    • A
    • A
    • S
    • Remote start
    • A
    • -
    • -
    • A
    • -
    • Rear parking assist
    • A
    • A
    • A
    • -
    • S
    • Power sunroof
    • A
    • A
    • A
    • A
    • A
    • Removable locking tailgate
    • S; EZ-Lift (A)
    • S
    • S (w/ Tailgate Assist)
    • Removable only
    • S
    • 6-disc CD/MP3 changer
    • A
    • 6-disc only
    • A
    • A
    • S
    • Premium audio
    • S (Bose)
    • S (JBL)
    • A
    • A (Infinity)
    • S (Rockford Fosgate)
    • Satellite radio
    • S (XM)
    • A (XM)
    • A (SIRIUS)
    • S (SIRIUS)
    • S (XM)
    • Navigation system
    • A
    • A
    • A
    • A
    • A
    • DVD entertainment system
    • A
    • A
    • A
    • A
    • A
    • Hands-free calling
    • S (OnStar)
    • S (Bluetooth)
    • -
    • A (UConnect)
    • S (Bluetooth)
    • Head room, front/rear (in.)
    • 41.5/40.6
    • 40.2/38.7
    • 40.1/39.6
    • 41.0/36.7
    • 41.0/38.9
    • Leg room, front/rear (in.)
    • 41.3/38.7
    • 42.5/44.5
    • 41.3/39.0
    • 41.0/40.0
    • 41.8/33.0
    • Shoulder room, front/rear (in.)
    • 65.2/65.2
    • 66.6/65.4
    • 65.8/65.8
    • 66.5/67.0
    • 65.1/64.9
    • Hip room, front/rear (in.)
    • 62.5/65.5
    • 63.0/62.6
    • 63.8/63.1
    • 65.0/65.3
    • 61.3/60.3
    • Bumper-to-bumper warranty
    • 3/36,000
    • 3/36,000
    • 3/36,000
    • 3/36,000
    • 3/36,000
    • Powertrain warranty
    • 5/100,000
    • 5/60,000
    • 5/60,000
    • Lifetime Limited
    • 5/60,000
    • Roadside assistance and courtesy transportation
    • 5/100,000
    • -
    • 5/60,000
    • -
    • Roadside assistance (A)
    • Corrosion warranty
    • 6/100,000
    • 5/unlimited
    • 5/unlimited
    • 5/100,000
    • 5/unlimited
    • Dual-stage frontal air bags
    • S
    • S
    • S
    • S (Multi-stage)
    • S
    • Front passenger sensing system
    • S
    • Passenger cut-off switch
    • S
    • Passenger cut-off switch
    • S
    • Seat-mounted side-impact air bags
    • -
    • S
    • -
    • -
    • A
    • Head-curtain side-impact air bags
    • A (w/rollover sensor)
    • S (w/rollover sensor)
    • -
    • A
    • A (w/rollover sensor)
    • Daytime Running Lamps
    • S
    • A
    • -
    • -
    • -
    • Automatic headlamps
    • S
    • Not Listed
    • S
    • S
    • S
    • Rain-sensing wipers
    • A
    • -
    • -
    • -
    • -
    • Heated windshield washer fluid
    • S
    • -
    • -
    • -
    • -
    • Tire pressure monitor
    • S
    • S
    • S
    • -
    • S
    • OnStar
    • S
    • -
    • -
    • -
    • -

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