It's highly likely that your 1983 Buick Park Avenue with a 307 engine needs attention to its transmission if it won't go into reverse after sitting for 3 years. Here's why:
* Fluid Degradation: Transmission fluid breaks down over time, especially when not in use. This can lead to thick, sludgy fluid that doesn't lubricate properly and can clog valves or other parts.
* Rust and Corrosion: Sitting for an extended period can cause rust and corrosion to build up within the transmission, impacting its function.
* Seals and Gaskets: Seals and gaskets can dry out and become brittle, leading to leaks and internal damage.
* Other Mechanical Issues: There might be other mechanical problems within the transmission itself, such as worn-out clutches or a faulty valve body.
Here's what you should do:
1. Check the Transmission Fluid: Check the fluid level. If it's low, top it off with the correct type of transmission fluid. If the fluid is very dark, burnt, or smells bad, it likely needs a complete flush and refill.
2. Start the Engine: With the transmission in Park, start the engine. See if the transmission fluid is moving at the dipstick. If it's not, there could be a pump issue.
3. Try Shifting into Reverse: Try shifting the transmission into reverse and see if it engages. If not, there's likely a mechanical issue.
4. Consult a Mechanic: If you're unsure about the problem, or if the problem persists, it's best to take your vehicle to a reputable mechanic for a professional diagnosis.
Important Considerations:
* Age of the Vehicle: A 1983 Buick Park Avenue is a relatively old car. The transmission may simply be worn out and require a rebuild or replacement.
* Maintenance History: Have you regularly maintained the transmission fluid over the years? This can have a big impact on its lifespan.
Remember, it's crucial to diagnose the problem correctly before taking any drastic actions. A mechanic can provide a professional opinion and guide you on the best course of action.
