Buy OEM 2004 Buick Part # 26040780. Power Steering Pump. 1/2 ton. 1/2, 3/4 & 1 Ton, 1996 New Style, 3/4 ton, 7300 lb GVW. 3/4 ton, 7300 lb GVW. Express, Savana; 1/2 Ton

Pump Assembly - Power Steering.
Power Steering Pump. Vacuum Brakes.

Power Steering Pump

Fits Express 1500, Express 2500, Savana 1500, Savana 2500

1/2 ton. 1/2, 3/4 & 1 Ton, 1996 New Style, 3/4 ton, 7300 lb GVW. 3/4 ton, 7300 lb GVW. Express, Savana; 1/2 Ton. Express, Savana; 3/4 Ton; Vacuum Boost Brakes.
Power Steering Pump - Repair or Replace
If the steering in your 2004 Buick whines or groans, or if your steering wheel is hard to turn, you may have a failed power steering pump.