* TH350 (Turbo Hydra-Matic 350): A very common and popular three-speed automatic.
* TH400 (Turbo Hydra-Matic 400): Another popular three-speed automatic, generally considered more durable than the TH350.
* 700R4 (Turbo Hydra-Matic 700R4): A four-speed automatic, offering better fuel economy than the older three-speeds.
* 200-4R: A four-speed automatic similar to the 700R4 but with different internal parts.
* SM465: A four-speed manual transmission.
* T5: A five-speed manual transmission (more common in later applications).
To determine which transmission will fit *your* Chevy 305, you need to provide:
* Year of the 305 engine: This significantly narrows down the possibilities.
* Year and model of the vehicle: The vehicle's specifications determine the transmission mounting points and other compatibility issues.
* Transmission type desired (automatic or manual): This further refines the choices.
With this information, I or a mechanic can give you a much more precise answer.