However, the exact location can vary slightly depending on the specific transmission (e.g., TH350, TH400, etc.) and any modifications that may have been made to the truck. It's a relatively small cylindrical component with vacuum lines connected to it.
To be certain, it's best to:
* Consult a repair manual: A Chevrolet pickup repair manual specific to the 1979 model year and your truck's transmission will show you the precise location with a diagram.
* Look at diagrams online: Searching for "1979 Chevy pickup transmission vacuum modulator location [your transmission type]" might yield helpful images.
* Use a visual inspection: Carefully examine the transmission and its surrounding area, looking for a small cylindrical component with vacuum lines.
Remember to be careful when working around the transmission, and always disconnect the battery's negative terminal before performing any repairs.
