To find them, you'll need to:
1. Consult a repair manual: A Chilton's or Haynes repair manual specific to your 1992 Chevy truck model will have diagrams showing the exact location of the ABS sensors. This is the most reliable method.
2. Look near the wheel hubs: The sensors are typically mounted on the axle housing near the wheel hubs, often embedded within the tone ring (a toothed metal ring). They're usually wired and have a connector. You may need to remove the wheel to see them clearly.
3. Follow the wiring: If you can locate the ABS module (usually under the hood or near the firewall), trace the wires back towards the wheels. This can help pinpoint the sensor locations.
Caution: Be careful when inspecting or working near the ABS sensors. They are fragile and can be easily damaged.