Alum Transmission 2nd Gen. Ball Spline

The Alum Transmission 2nd Gen. Ball Spline from BERT TRANSMISSIONS is a purpose-built manual gearbox engineered for high-performance drag racing and bracket racing applications. Weighing 46.25 lbs and featuring an aluminum case construction, this transmission delivers the lightweight advantage critical for short-track acceleration while maintaining the durability required in competitive motorsports. Designed specifically for racers seeking a compact, efficient power transfer solution, the second-generation ball spline design represents a proven evolution in drag racing transmission technology for both street and strip use.

At the heart of this transmission lies an internal hydraulic clutch system paired with a 10-input spline design, delivering seamless engagement and predictable power delivery to the wheels. The two-forward-speed configuration with reverse gearing eliminates unnecessary weight and parasitic losses, allowing the engine to operate in its optimal power band throughout a quarter-mile run. The aluminum case reduces unsprung weight compared to cast-iron alternatives, directly improving acceleration metrics and reducing driveline inertia—a critical factor in competitive racing where tenths of a second determine winners. The ball spline design minimizes wear and ensures consistent engagement cycle after cycle, essential for consistent performance during repeated competitive passes.

Racers and serious automotive enthusiasts running small-block engines in dedicated race vehicles benefit most from this transmission's lightweight, no-frills engineering philosophy. The unit is ideal for door-slammer drag cars, junior dragster platforms, and bracket racing programs where weight savings directly correlate to ET improvement. Installation requires proper driveline alignment and a compatible quick-change rear assembly or custom fabrication, making this a transmission for builders with fabrication experience or professional race shops. Verify compatibility with your engine's output shaft configuration and ensure adequate cooling and lubrication during operation.