One of the massive updates the Avalanche has gone through is the inclusion of a is the addition of a new Hydra Matic 6L80 six-speed, automatic transmission which takes the place of old four-speed 4L60 unit. Under the hood of the 2WD there is a 5.3L OHV V-8 that produces 320 bhp and a torque of 340 lb/ft while the 4WDs are equipped with a 5.3L OHV V-8 pumping 310 bhp and a torque of 335 lb/ft made from an aluminum block, it will later switch over to an iron-block 5.3L getting a 320 bhp and 340 lb/ft. it also features an Active Fuel Management system, which automatically shuts off half the cylinders under light loads, and a Flex Fuel capability, allowing it to run on E85 Ethanol. Both the 2WD and 4WD models are also available with an optional 6.0L OHV V-8 that consists of the Active Fuel Management system as well as Variable Valve Timing making 366 bhp and 376 lb/ft of torque. The gasoline 5.3L V-8 gets an EPA-estimate of 14 mpg in the city and 20 mpg on the highway, while the Flex-Fuel 5.3L V-8 gets a poor 10 mpg city and 15 mpg on highways. The 6.0L V-8 fairs better than the flex fuel version, with 14 mpg city and 19 mpg on the highway.
The general layout of the avalanche is, a front engine, Four-Wheel-Drive or an All-Wheel-Drive, 4 to 6 passenger, four-door truck.
The avalanche weighs in at 5478-5645 lbs and a maximum towing capacity for the 2WD is 8100 lbs and 7900 lbs for the 4WD models.
Majority of the changes on the 2009 Avalanche model are on the inside. some of the features that Chevy have included are; a very useful backup camera and rear parking assist, dual-zone climate control, navigational system, a remote starting system, rain-sensing wipers, and a DVD entertainment system on the rear-seats.
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