Before you begin:
* Identify your speaker locations: This is crucial. Carefully examine the rear side panels and the rear deck. Look for speaker grilles or cutouts that suggest speaker locations. If you're unsure, consult a 1979 Trans Am service manual (available online or through parts suppliers). Pictures of similar cars online might also help.
* Gather tools: You'll likely need various screwdrivers (Phillips and flathead), possibly panel removal tools (to avoid scratching), wire strippers/cutters, soldering iron or crimp connectors, and electrical tape.
* Acquire replacement speakers: Choose speakers that fit the available space and your desired sound quality. Measure the existing speaker cutouts (if applicable) to ensure proper fit. You may need to adapt the mounting if the new speakers don't match the old ones perfectly.
General Procedure (assuming speakers are in the rear side panels or rear deck):
1. Panel Removal: This is the trickiest part. You'll need to carefully remove the interior panels covering the speakers. This often involves removing screws, clips, and possibly some trim pieces. Be gentle to avoid breaking any plastic clips. Use panel removal tools if available to help pry panels loose without damage.
2. Disconnect existing speakers: Once the panel(s) are removed, disconnect the wiring harness from the old speakers. Take pictures or make notes to remember how the wires were connected.
3. Remove old speakers: Carefully remove the old speakers from their mounting location. This might involve unscrewing them or simply prying them loose.
4. Install new speakers: Carefully install the new speakers, ensuring they are securely mounted.
5. Reconnect wiring: Connect the wires from the new speakers to the existing wiring harness, matching the polarity (+ and -). Use solder or crimp connectors for a secure connection, followed by electrical tape to insulate the connections.
6. Reassemble panels: Carefully reinstall the interior panels and trim pieces, ensuring everything is secure.
Specific considerations:
* Rear deck speakers: Accessing speakers in the rear deck may require removing the entire rear deck panel, which can be more involved.
* Wiring: If no existing wiring is present, you'll need to run new speaker wire from the head unit to the rear speaker locations. This will require careful routing of the wires to avoid interfering with other components or creating hazards. You may need to drill small holes for the wires to pass through.
* Speaker size and mounting: The size of the factory speakers and the mounting style will vary. You might need speaker adapters or mounting brackets to accommodate new speakers that are a different size.
Safety Precautions:
* Disconnect the car battery before beginning any electrical work to avoid short circuits.
* Be careful not to damage any interior panels or wiring during removal and reinstallation.
* If you're not comfortable working with car audio systems or interior components, consider taking your car to a professional car audio installer.
Because of the variations in 1979 Trans Am models, consulting a repair manual specific to your vehicle is strongly recommended. This will provide detailed diagrams and instructions to help you navigate the specific challenges of your car.
