* For street use and mild performance:
* TH350 (Turbo Hydra-Matic 350): A very popular and robust three-speed automatic. Relatively simple, readily available, and parts are cheap. Good for cruising and light towing.
* 700R4/4L60E (and variations): A four-speed automatic offering better fuel economy than the TH350, especially at highway speeds. More complex than the TH350, but still relatively common and readily serviceable. The 4L60E is the electronically controlled version.
* For more aggressive performance:
* TH400 (Turbo Hydra-Matic 400): A strong and durable three-speed automatic, ideal for high-horsepower applications and towing heavy loads. Lacks overdrive, resulting in higher RPMs at highway speeds.
* 700R4/4L60E (built for performance): These can be built to handle significant horsepower, but require upgrades to withstand the increased stress.
* Manual transmissions: Various Muncie, Borg-Warner, and Tremec manual transmissions are popular choices, offering greater control and efficiency, particularly for racing or spirited driving. The choice depends on the desired gear ratios and strength requirements (e.g., a Tremec T56 is a popular choice for high-performance applications).
* For towing:
* TH400: Excellent for towing due to its strength and durability.
* 4L60E/4L80E: The 4L80E is a heavier-duty version of the 4L60E designed for towing and high horsepower applications.
Before choosing a transmission, consider:
* Horsepower and torque of your 350: A high-performance 350 will require a more robust transmission than a stock engine.
* Intended use of the vehicle: Street driving, racing, off-roading, or towing will each dictate different transmission needs.
* Budget: Some transmissions and their associated parts are more expensive than others.
* Your mechanical skills: Some transmissions are easier to work on and maintain than others.
In short, you need to specify your intended use and budget to determine the *best* transmission for your specific Chevrolet 350 small block application. Consulting with a transmission specialist or experienced mechanic is highly recommended.
