GMPartsGiant.com offers the wholesale prices for genuine 2019 GMC Canyon 4WD Crew Cab Denali parts. Parts like Automatic Transmission Case Extension Assembly are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.5L, 4 Cyl 2.8L Diesel, 6 Cyl 3.6L. Model Code: CREW CAB SLT - 6'2" BOX, SLT CREW CAB - 5'2" BOX.