* Most common location (for both 2WD and 4WD): On the top of the differential housing. It's a small sensor, often with a single wire connector.
* Less common location (primarily on some 4WD models): On the transfer case.
To find it definitively:
1. Consult your vehicle's repair manual: This is the most reliable source. The manual will have diagrams showing the exact location.
2. Use a repair database: Online resources like Chilton, AllData, or Mitchell 1 often have diagrams and information specific to your year and model. (Subscription may be required).
3. Look at diagrams online: Searching for "1999 Chevy Silverado speed sensor location" may yield some helpful diagrams, but be cautious as these might not be perfectly accurate for your specific configuration.
4. Visual inspection: Once you have a general idea of where it might be located (likely on the differential or transfer case), carefully examine the area. Look for a small sensor with a wire harness attached that appears to be mounted near a rotating component.
Important Note: Before attempting any repairs, disconnect the negative battery terminal to prevent electrical shorts. If you're unsure about working on your vehicle, it's best to consult a qualified mechanic.
