Alum Driveshaft 39.5in Long

The Alum Driveshaft 39.5in Long from Precision Shaft Technologies is engineered for builders and restorers seeking a lightweight alternative to stock steel driveshafts. This 39.5-inch aluminum driveshaft reduces rotational mass, improves acceleration response, and enhances fuel economy—critical gains for street performance, classic car restorations, and custom builds. Whether you're modifying a muscle car, hot rod, or street machine, an aluminum driveshaft transfers power more efficiently while minimizing parasitic drag on your engine.

Constructed from high-strength aluminum, this driveshaft combines lightweight construction with the durability needed for modified powertrains. The 39.5-inch length accommodates mid-length vehicle platforms, making it ideal for rear-wheel-drive applications where driveline balance and vibration control matter. Aluminum's lower density compared to steel reduces unsprung weight significantly—at just 10.1 lbs, this shaft minimizes rotational inertia without compromising torsional rigidity. The compact package (5.8 x 5.8 x 43.8 inches) fits tight engine bays and custom chassis configurations while maintaining structural integrity under load.

High-performance enthusiasts, restoration shops, and drag racing competitors benefit most from upgrading to this aluminum unit. It pairs well with modified transmissions, upgraded differentials, and tuned engines where reduced drivetrain weight amplifies horsepower delivery. Installation requires verification of your vehicle's u-joint sizes and mounting flange compatibility—confirm your original driveshaft length and end configurations before ordering. This shaft works across various American muscle cars, classic trucks, and custom hot rods with 39.5-inch driveline requirements, delivering measurable improvements in throttle response and overall vehicle dynamics.