GMPartsGiant.com offers the wholesale prices for genuine 1999 GMC Yukon 2WD parts. Parts like Steering Pump Assembly 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.