What type of fluid is in the differential of a 93 Ford Aerostar van?

The differential of a 1993 Ford Aerostar van typically uses gear oil, specifically a hypoid gear oil with a viscosity rating of 75W-90 or 80W-90. Always check the owner's manual or service guide for the exact specifications, as some models may have different requirements. It's also important to ensure that the oil meets the API GL-5 standard for optimal performance and protection.