Location of drain plug on 1998 silverado pickup?

The location of the drain plug on a 1998 Silverado pickup's differential varies slightly depending on the axle configuration (rear-wheel drive, 4x4) and specific axle type (e.g., 8.5-inch, 10-bolt). However, it's almost always on the bottom of the differential housing, near the bottom center or slightly offset to one side.

To be certain:

1. Look underneath the truck: The differential is the large housing located towards the rear of the vehicle, between the rear wheels. It's usually a fairly prominent component.

2. Look for a square or hex-shaped plug: The drain plug is usually a relatively small bolt or plug, typically square or hex-shaped, located on the bottom of this housing.

3. Consult a repair manual: A repair manual specific to your 1998 Silverado's year, make, model, and axle configuration will provide a diagram showing the exact location. This is the most reliable method.

Caution: Before attempting to drain the differential fluid, ensure the truck is parked on a level surface and the vehicle is securely supported (e.g., jack stands). The differential fluid will be hot if the truck has been recently driven. Use appropriate safety precautions.