GMC

The entire chassis, driveline and braking system have been overhauled. Here you can see the 2011 chassis to the left. The new 2011 chassis is fully boxed through its entire length providing superior rigidity increasing payload and improving handling.

To support the heavier payload the suspension was redesigned to include longer, wider leaf springs, heavier torsion bars and oversized shock absorbers.

The upgrades didn’t stop there, new oversized brakes have been included specifically designed for heavy applications and to reduce brake fade under continued braking situations.

To complement the massive 4 wheel disc brakes is the factory standard exhaust brake. This exhaust brake is very similar to that found on most heavy haulage trucks. It’s essentially a valve that closes in the exhaust system to help slow the vehicle using the engine drag instead of the brakes.

This increases brake life while providing a safer and more comfortable towing experience.

To further ensure the Sierra HD’s position as a class leader the engineers upgraded the engines horsepower and torque ratings to a massive 397hp/297kw and 775lb/1,049Nm of torque.

This results in a truck that weighs just over 3,000kg that is capable of running 0-100kph while carrying a driver, fuel and 750kg in an amazing 7.66 seconds!!

The power is transmitted to the rear wheels through the incredible Allison 6 speed automatic transmission which features a triptronic manual shift mode and a driver selectable automatic tow/haul mode that reprograms the transmission allowing greater control while under load.

This tow/haul model down-shifts while descending a hill or even while slowing at the traffic lights to reduce the required braking effort.

All trim packages have been retained along with a few additions…

WT – Work truck package now comes standard with air conditioning and cruise control. All previous features such as dual air bags, full instrumentation, manual windows, rubber floors and cloth seats are retained. Ideal for mining and fleet applications.

SLE  - All LT features have been retained including; power windows, power mirrors, velour trim (optional leather), tinted windows, CD stereo, dual glove boxes, under seat storage, folding front centre seat or optional front bucket seats.

SLT  - The LTZ comes standard with leather trimmed 12 way power operated front seats, both with seat heaters and for 2012 models optional seat coolers.

Tow ratings have been upgraded to allow 2500HD trucks to tow up to 7,200kg and 3500HD trucks up to a massive 9,300kg.

Call our friendly sales team to find out more about the legendary power on offer from the GMC Sierra.