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This GMC Sierra 2500HD has a strong Turbocharged Diesel V8 6.6L/403 engine powering this Automatic transmission. WHEELS, 18 (45.7 CM) CHROMED ALUMINUM includes 18 x 8 (45.7 cm x 20.3 cm) steel spare wheel. (STD), WHEEL, 18 X 8 (45.7 CM X 20.3 CM) FULL-SIZE, STEEL SPARE., TRANSMISSION, ALLISON 1000 6-SPEED AUTOMATIC, ELECTRONICALLY CONTROLLED with overdrive, electronic engine grade braking and t...