Choose an Engine Size for 2004 GMC Sierra 3500 Use the links below to find the right magnetic drain plug for your vehicle. Allison 1000 Tranmission Drain PlugDuramax Fuel Bleeder ScrewDuramax Oil Pan - Banana PanV6-4.3LV8-4.8LV8-5.3LV8-6.0LV8-6.6L Diesel TurboV8-8.1L