Allison 1000 6-Speed Automatic, 4WD, Black Leather. Red Hot 2019 Chevrolet Silverado 2500HD LTZ 4WD Allison 1000 6-Speed Automatic Duramax 6.6L V8 TurbodieselLOWEST TAX RATE IN THE STATE @ 6.25%. Selling and Servicing vehicles in Sandwich, Plano, Yorkville, Oswego, Naperville, Plainfield, Joliet, DeKalb, Elburn, St. Charles, Geneva, Batavia, Somonauk, Leland, Earlville, Mendota, Shorewood, Channahon, Aurora, North Aurora, Lisle, Ottawa, Dixon, Sterling, LaSalle, Peru, Rockford and Sugar Grove for over 4 Decades. ... see more