The heavy-duty 2500 models have an 8.1-liter V8 and a 37.5-gal fuel tank, 6.5 gal more than the 1500. Both have automatic transmission, front side airbags, and antilock 4-wheel disc brakes. Avalanche offers rear-wheel drive with optional traction control, or GM's Autotrac 4WD that can be left engaged on dry pavement and includes low-range gearing.
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