Vortec™ power — choose the available Vortec 6.0L V8, Vortec 8.1L V8, or the DURAMAX™ 6.6L Turbo Diesel
The mighty Vortec 6000 V8 — part of Sierra's Heavy Duty series of engines — is certainly not short on power. It delivers:
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300 hp @ 4400 rpm
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360 lb-ft torque @ 4000 rpm
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Fuel efficiency — 13 city, 17 highway
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Standard on Crew Cab® models
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A maximum towing capacity of up to 15,700 lbs
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An available, class-exclusive Allison® 1000 series five-speed automatic transmission
Offered on heavy duty trucks with either the Vortec™ 8100 V8 or DURAMAX™ Diesel 6600 V8, the advanced Allison® 1000 Series five-speed automatic includes an advanced grade-braking capability for superb control when trailering — especially downhill.
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When in drive, the transmission automatically selects the gear for each drive range and engages the torque converter lock-up clutch
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Clutches are hydraulically actuated and spring released, with automatic compensation for wear
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Helical-type gears are used for quieter operation
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Narrow gear ratio splits provide more torque in low gears
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Large, strong gears and clutches provide added durability
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Available in multiple configurations and 2WD and 4WD
