What type of fluid to use for 2003 envoy differential fluid?

For a 2003 GMC Envoy, the recommended differential fluid is typically 75W-90 gear oil that meets API GL-5 specifications. If your Envoy is equipped with a limited-slip differential, it's advisable to use a fluid that contains friction modifiers. Always consult your owner’s manual or a trusted mechanic to confirm the specific requirements for your vehicle.