GMPartsGiant.com offers the wholesale prices for genuine 1999 GMC Yukon 4WD parts. Parts like A/C Refrigeration System are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 5.7L. Model Code: CLASSIC 2 DOOR 1/2 TON, CLASSIC 4 DOOR 1/2 TON.