GMPartsGiant.com offers the wholesale prices for genuine 2002 GMC Sierra 2500 4WD parts. Parts like Transmission Filler Tube are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 6.0L, 8 Cyl 6.6L Diesel, 8 Cyl 8.1L. Model Code: 2500 CREW CAB LONG BOX, 2500 CREW CAB STANDARD BOX, 2500 EXTENDED CAB STANDARD BOX, 2500 REGULAR CAB.