The 1978 Pontiac 301 V6 typically came with a THM180 3-speed automatic transmission, or possibly a manual transmission, depending on the specific vehicle and options. There are some variations depending on the application (truck, car, etc.) that would have specific bellhousing patterns and bolt configurations.
Therefore, simply stating "a THM180" isn't entirely accurate without knowing the exact vehicle. To find a definitively compatible transmission, you need to:
* Identify the vehicle: Knowing the make, model, and year is essential. This will help determine the original transmission.
* Check the bellhousing: The bellhousing is the part of the transmission that bolts to the engine. Its bolt pattern must match the engine. There's no single answer as various patterns were used even with the THM180 across different applications.
In short, while a THM180 is a *likely* candidate, you must verify compatibility based on the vehicle's specific details and the transmission's bellhousing pattern. A parts catalog specific to your 1978 Pontiac model with the 301 V6 is your best resource.
