To find the correct flexplate, you must know the transmission type. Common transmissions for that era Buick 3.8L might include:
* TH125C: This is a common possibility.
* 200-4R: Another possibility. (Less likely, but possible depending on trim and options).
* Possibly others: There might be other less common transmissions used.
You will need to:
1. Identify your transmission: Check the transmission identification tag (usually on the side of the transmission case).
2. Use that information to find the correct flexplate: Use the transmission identification number to search online parts databases (like RockAuto, AutoZone, Advance Auto Parts, etc.) or consult a Buick parts catalog specific to 1979 models. The year and engine are helpful too.
Providing the transmission type will allow for a more accurate answer.