Alum Driveshaft 39in Long

The Alum Driveshaft 39in Long (Model 100390) is a lightweight aluminum driveshaft engineered for high-performance vehicle builds and drag racing applications where rotational mass reduction directly impacts acceleration and fuel economy. Built by Precision Shaft Technologies, this 39-inch aluminum shaft replaces heavy steel OEM driveshafts on mid-engine or custom-built vehicles, making it an essential upgrade for enthusiasts serious about weight savings and powertrain efficiency. Whether you're building a street rod, competition bracket racer, or swapping powerplants into a custom chassis, an aluminum driveshaft is one of the most effective ways to reduce unsprung rotational mass without sacrificing durability.

Aluminum construction cuts weight dramatically compared to traditional steel shafts—this unit tips the scales at just 10.1 lbs, translating to measurable improvements in launch characteristics and overall vehicle responsiveness. The 39-inch length accommodates mid-range wheelbase applications common in tube-frame drag cars and custom hot rods, while the aluminum alloy core provides the torsional rigidity needed to handle high-horsepower loads without flex or vibration. Precision-engineered with balanced construction, aluminum driveshafts also run cooler than steel equivalents, reducing heat transmission to the cabin and minimizing thermal expansion issues during extended racing sessions.

This driveshaft suits high-performance applications including race cars, street rods, and custom fabrication projects where OEM driveshaft geometry doesn't apply. Proper installation requires correct U-joint selection, driveline balancing, and carrier bearing support if the shaft spans more than 65 inches—consult your builder or shop manual for your specific application. The compact 5.9 x 5.9-inch diameter profile accommodates tight underbody clearances typical of heavily modified or mid-engine vehicles where space is at a premium.