fits make: Gmc. year: 1957.

( Manufacturer Part Number: SM318 ), ( Part Type: Transmission )
The SM318 transmission is a crucial component for any 1957 GMC 150, offering reliable performance and smooth gear shifts. This manual transmission is a three-speed unit, designed with durability in mind to handle the demands of daily driving and occasional towing tasks.
The SM318 transmission features a heavy-duty design, with robust gears and bearings that are built to withstand the rigors of time and use. The synchronizers are precision-machined to ensure seamless shifting between gears, reducing the risk of clutch chatter and providing a smooth ride.
The SM318 transmission also includes a robust clutch system, with a diaphragm spring clutch that provides excellent engagement and disengagement of the gears. This ensures that the vehicle responds promptly to acceleration and deceleration commands, making for a more enjoyable driving experience.
The SM318 transmission is also known for its ease of installation and maintenance. The transmission housing is robust and made of high-quality materials, ensuring a secure fit in the vehicle's transmission tunnel. The transmission also includes easily accessible service points, making routine maintenance a straightforward process.
In summary, the SM318 transmission is a reliable and robust option for any 1957 GMC 150. Its heavy-duty design, precision-machined synchronizers, and robust clutch system ensure smooth, reliable performance, while its ease of installation and maintenance make it a practical choice for vehicle owners.
Pros of buying a SM318 transmission for a 1957 GMC 1950:1. Availability: The SM318 is a common transmission for older vehicles, which means it's easy to find used parts and rebuild kits.
2. Reliability: The SM318 is a proven design that has been used in many vehicles over the years, and it's known for its durability and reliability.
3. Cost: Compared to some newer transmissions, the SM318 is relatively affordable to purchase and repair.
Cons of buying a SM318 transmission for a 1957 GMC 1950:1. Compatibility: The SM318 may not be a perfect fit for your specific vehicle, which could require modifications to the transmission mount, clutch pedal, or other components.
2. Performance: The SM318 is a three-speed transmission, which may not provide the same level of performance as a modern four- or five-speed transmission.
3. Fuel Efficiency: Older transmissions like the SM318 are not as fuel-efficient as modern transmissions, which could result in higher fuel costs over time.
Conclusion: If you're looking for a reliable, affordable transmission for your 1957 GMC 1950, the SM318 could be a good option. However, you should be aware of the potential compatibility issues and performance limitations, and be prepared to make any necessary modifications or upgrades. It may be worth considering a modern transmission with more gears and better fuel efficiency if performance and fuel economy are important to you. Ultimately, the best choice will depend on your specific needs and budget.
Used as standard transmission on all through 59 Gmc 1/2 and 3/4 ton trucks with 6 cylinder engines well 56 8. Previous owner removed it in operating condition to replace the engine and tyranny with more modern hardware.