The Express can carry up to 15 people, and is also popular with contractors as a work van. A 6.6L V-8 Duramax® turbodiesel is available on some models and can tow up to 10,000 lbs, and has a 12,300 lbs. GVWR. Other engine options include a 4.3L V-6, 4.8L,5.3L, or 6.0L V-8. A 4-speed automatic is the only transmission. AWD is available on some models. Diesel models can be equipped with an auxiliary fuel operated interior heater.