GMC Sierra 2500HD


People talk about moving mountains as if it’s a big deal. But you’re a pro. To you, it’s simply part of your daily routine. We understand. Nothing throws you for a loop.

You simply move through so-called obstacles with ease. Pushing yourself further— always looking for solutions. As well as new mountains to conquer.

Discover the heavy-duty truck for you—the GMC Sierra HD.







The redesigned cabin in the 2015 Sierra Denali combines triple door seals, inlaid doors and other refinements throughout the truck to create the quietest heavy duty GMC pickup ever. Add premium materials, supportive seats and generous storage and you've set the new standard in heavy-duty truck interiors. Denali also has heated and cooled Denali-embossed leather-trimmed front bucket seats, a heated leather-wrapped steering wheel, new soft-touch instrument panel with burnished aluminium trim and contrasting stitching.



The 2015 Sierra Denali's all-new instrument panel puts controls where they're most visible - at your fingertips - and information at the sound of your voice thanks to a new available 20 cm diagonal colour touch radio with navigation system. Sierra Denali provides the latest technologies to help you work smarter and more efficiently. From available driver alert safety technologies to Denali's personalised driver display, you're surrounded by everything you need to perform your best.



An available centre console storage compartment is designed to double as a filing cabinet, so you'll have a place to keep hanging files, a laptop and other mobile devices.



In a GMC pickup first, Sierra introduces new projected-beam headlamps fully integrated into the grille surround. The lamps are further enhanced by available LED signature lighting. In addition to triple door seals and thicker windscreen glass, Sierra's sculptured styling helps reduce wind noise to create a quieter cabin.



The 2015 GMC Sierra Denali features an interior designed to bring you three key things: more comfort, less noise and a seamless connection to your digital world.

  • Air Conditioning – dual-zone climate control
  • Driver Information Centre - with 10.5 cm diagonal colour display
  • Steering wheel - leather wrapped with audio and cruise control
  • Steering wheel - heated
  • Steering column - tilt-wheel and telescope manual operation
  • Cruise control
  • Defroster - rear-window electric
  • Power equipment - power door locks and windows
  • Floor covering - colour-keyed carpeting with rubberised vinyl floor mats
  • Front and rear park assist - ultrasonic
  • Power adjustable pedals
  • Rear view camera system with dynamic grid lines
  • Remote start system
  • Remote keyless entry
  • Rearview mirror with inside rearview auto-dimming feature, included with outside heated power-adjustable vertical chrome-capped camper mirror
  • Sill plates - bright accent
  • Optional Sunroof - power sliding with express-open
  • Windows - power with driver express up-and-down and express down on all other windows
  • Power rear sliding window with rear defroster
  • Windshield wipers - interval control
  • 20.3 cm diagonal colour touch screen radio
  • Single slot CD/MP3
  • Bluetooth for phone
  • 6-speaker audio system, Bose premium audio system with six speaker (7 speaker including subwoofer when ordered with bucket seats)
  • Heated and cooled perforated leather-appointed front bucket seats - requires front bucket seats
  • Seats - rear folding 60/40 spilt 3-passenger bench, includes child seat top tether anchor



The impressive appearance of the GMC Sierra Denali is enough to tell you this full-size pickup is ready for whatever you throw at it. Plenty of tray space, easy-lift tailgate and an ingenius step-up are all part of the ready-for-work package.

  • Bumpers - rear, body colour with Cornerstep bumper
  • Bumpers - body colour
  • Side steps - chromed tubular with 15 cm rectangular design
  • Door handles - chrome
  • Moldings - bodyside, chrome
  • Grille - chrome with unique Denali accents
  • Headlight - halogen projector-beam
  • Lights - under-rail LED lighting, cargo box
  • Exterior towing mirrors - heated
  • Wipers - front intermittent
  • Wheelhouse liners - rear, single wheel
  • Tailgate - locking with EZ-lift and lower tailgate feature
  • Optional Cargo box - movable tie-downs, high-mounted (4)
  • Recovery hooks - front frame-mounted (black)
  • Optional Cargo box - box rail caps
  • Tyre carrier - outside spare, winch-style includes lock
  • Optional Spray-in bedliner
  • Optional Roll-up tonneau cover
  • Glass - solar-ray deep tinted



GMC Sierra Denali was engineered to tow heavy loads in extreme conditions, thanks to a host of trailering technologies like Stabilitrak, Trailer Sway Control, the Diesel Exhaust Brake and Hill Start Assist. 


  • Optional Trailer wiring provisions
  • Brakes - 4 wheel disc with 4-wheel antilock
  • Rear axle - 3.73 ratio
  • Eaton heavy-duty automatic rear differential
  • Tow Haul Mode
  • 18" wheels
  • Steering - power
  • Auxiliary external transmission oil cooler
  • Exhaust - aluminized stainless steel muffler and tailpipe
  • Alternator - 150 amps
  • Auxiliary external engine oil cooler
  • Optional Exhaust brakes - switch activated
  • Optional High idle switch
  • Frame - fully boxed with hydro-formed front section
  • Integrated trailer brake controller
  • Battery - heavy-duty maintenance-free run-down protection and retained accessory power
  • Air cleaner - high capacity
  • Stabilitrak Stability Control System
  • Suspension - front independent with torsion bars, includes 51mm twin-shock absorbers and 33mm front stabiliser bar
  • Rear multi-leaf, semi-elliptical with urethane jounce bumpers
  • Optional 20" wheels


  • Engine - Duramax 6.6 litre Turbo-Diesel V8 with direct injection
  • Transmission - Allison 1000 series 6-speed automatic includes tow-haul mode and electronic Powertrain Grade Braking
  • 4x4 - electronic shift rotary dial controls 2-speed and 2.69-to-1 low-range



GMC Sierra Denali is a step up in safety with standard daytime running lights, tyre pressure monitoring system and rear vision camera as just the start.

  • Optional Lane departure warning and forward collision alert - included and only available with Driver Alert Package
  • Optional Safety Alert Driver Seat - included and only available with Driver Alert Package
  • Airbags - front-seat-mounted side-impact driver and right front-passenger air bags for thorax and pelvis protection
  • Airbags - single-stage frontal for driver and front passenger
  • Exhaust brakes
  • Tyre pressure monitoring system (excludes spare)
  • ABS brakes
  • Optional Airbags - front and rear head curtain side-impact air bags for all outboard seating positions
  • Tailgate - locking
  • Theft Deterrent System - includes and only available with Driver Alert package

Please note that these colour and seating options are presented for information only. Performax cannot guarantee vehicles of particular colour and seating will be in stock at any given time.


GMC Denali colours exterior



GMC Denali colours interior


Performax International offers an industry exclusive three year/100,000km factory backed new car warranty with 24 hour Road Side Assist. This is backed 100% by our factory; it is not an after-market new car warranty or mechanical warranty as favoured by most companies.

A Performax Warranty is all about looking after the customer, not looking for reasons to decline a claim. The customer doesn’t call an office in a major city and talk to an operator that knows nothing about the vehicle, and only thinks of them as a number; they call their Performax Dealer or Head Office and deal direct with an employee that usually knows what they are talking about.


Performax International operates the only original equipment manufacturer (OEM) style dealership network in Australia, with dealers throughout the country stocking and servicing our vehicles. Customers often question the ability to get help when travelling in remote areas; it’s no different to any other modern vehicle.

Basic repairs can be done anywhere by any competent mechanic, and Performax is happy to offer them assistance over the phone. Most common parts are carried in Australia and can be despatched same day, just like a Toyota. And just like a Toyota if it’s not a common replacement part it gets flown in from overseas usually within seven to 10 days.


Performax International carries an extensive range or spare parts, genuine and aftermarket accessories. Customers have the ability to customise their vehicles to suit the application, whether it be outback touring, heavy duty towing, or a show pony we can accommodate.


Brought your own vehicle in to Australia for us to convert it? Your conversion has its own 12 month / 20,000km warranty.

For more information about the Performax International warranty, please call 1800 737 367.

While all efforts are made to ensure Vehicle specifications and features are correct at the time of publication, it is the consumers responsibility to verify these before making a purchasing decision. Performax International cannot be held responsible for changes in specifications or changes made to meet ADR’s.